diff --git a/package-lock.json b/package-lock.json
index 7974517f..6c6fa62a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,6 +15,7 @@
         "firebase": "^10.9.0",
         "graphemer": "^1.4.0",
         "jotai": "^2.7.1",
+        "jotai-location": "^0.5.4",
         "next": "14.1.4",
         "openapi-fetch": "^0.9.3",
         "openapi-typescript-helpers": "^0.0.7",
@@ -2089,7 +2090,6 @@
     },
     "node_modules/@clack/prompts/node_modules/is-unicode-supported": {
       "version": "1.3.0",
-      "dev": true,
       "inBundle": true,
       "license": "MIT",
       "engines": {
@@ -9284,6 +9284,14 @@
         }
       }
     },
+    "node_modules/jotai-location": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/jotai-location/-/jotai-location-0.5.4.tgz",
+      "integrity": "sha512-IqpyYLAF6HgoDoJVlX66IGvgrugCA1LJybT01NqenpdwypPtUB6u0cnJZMbN6axU+Yl2FTI6l+4x9IWh4WGFRA==",
+      "peerDependencies": {
+        "jotai": ">=1.11.0"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
diff --git a/package.json b/package.json
index e547a332..1c18bc2d 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
     "firebase": "^10.9.0",
     "graphemer": "^1.4.0",
     "jotai": "^2.7.1",
+    "jotai-location": "^0.5.4",
     "next": "14.1.4",
     "openapi-fetch": "^0.9.3",
     "openapi-typescript-helpers": "^0.0.7",
diff --git a/src/common_components/Button.tsx b/src/common_components/Button.tsx
index 1cfcbf12..eca1988b 100644
--- a/src/common_components/Button.tsx
+++ b/src/common_components/Button.tsx
@@ -12,7 +12,6 @@ export const Button: FC<Props> = ({ color, size = "medium", className, children,
   const button = cva({
     base: {
       borderRadius: "sm",
-      display: "block",
       cursor: "pointer",
       borderWidth: 2,
       borderStyle: "solid",
diff --git a/src/common_components/auth/AuthUI.tsx b/src/common_components/auth/AuthUI.tsx
index 693072a8..f9a5e2cb 100644
--- a/src/common_components/auth/AuthUI.tsx
+++ b/src/common_components/auth/AuthUI.tsx
@@ -1,15 +1,18 @@
+"use client";
 import React, { FC, PropsWithChildren } from "react";
 import { Header } from "@/common_components/header/Header";
 import SigninPage from "@/common_components/auth/signin/page";
 import SignupPage from "@/common_components/auth/signup/page";
-import { atom, useAtomValue } from "jotai";
+import { useAtomValue } from "jotai";
 import { useAuthState } from "@/lib/firebase";
 import { Loading } from "@/common_components/Loading";
 import { css } from "@styled-system/css";
 import { EmailVerification } from "@/common_components/auth/EmailVerification";
 import { usePathname } from "next/navigation";
+import { atomWithHash } from "jotai-location";
+import { ResetPassword } from "./resetPassword/ResetPassword";
 
-export const authModeAtom = atom<"signIn" | "signUp">("signIn");
+export const authModeAtom = atomWithHash<"signIn" | "signUp" | "resetPassword">("authMode", "signIn");
 
 export const AuthUI: FC<PropsWithChildren> = ({ children }) => {
   const authMode = useAtomValue(authModeAtom);
@@ -27,6 +30,22 @@ export const AuthUI: FC<PropsWithChildren> = ({ children }) => {
     return children;
   }
 
+  const Component: React.FC = () => {
+    switch (authMode) {
+      case "signIn":
+        return <SigninPage />;
+
+      case "signUp":
+        return <SignupPage />;
+
+      case "resetPassword":
+        return <ResetPassword />;
+
+      default:
+        return <></>;
+    }
+  };
+
   return (
     <>
       <Header />
@@ -40,7 +59,7 @@ export const AuthUI: FC<PropsWithChildren> = ({ children }) => {
       ) : authState.user ? (
         <>{authState.user.emailVerified ? <>{children}</> : <EmailVerification />}</>
       ) : (
-        <>{authMode === "signIn" ? <SigninPage /> : <SignupPage />}</>
+        <Component />
       )}
     </>
   );
diff --git a/src/common_components/auth/EmailVerification.tsx b/src/common_components/auth/EmailVerification.tsx
index b595dfbb..b6df2058 100644
--- a/src/common_components/auth/EmailVerification.tsx
+++ b/src/common_components/auth/EmailVerification.tsx
@@ -1,12 +1,12 @@
 import { center } from "@styled-system/patterns";
-import { css } from "@styled-system/css";
-import { Button } from "@/common_components/Button";
+import { css, cx } from "@styled-system/css";
 import SendButton from "@/assets/SendButton.svg?url";
 import Image from "next/image";
 import { sendEmailVerification } from "firebase/auth";
 import { useAuthState } from "@/lib/firebase";
 import { useState } from "react";
 import toast from "react-hot-toast";
+import { buttonStyle } from "@/recipes/button";
 
 export const EmailVerification = () => {
   const authState = useAuthState();
@@ -58,24 +58,26 @@ export const EmailVerification = () => {
         </section>
         <p className={css({ color: "gray.700" })}>再送しても届かない場合は時間を空けてからお試しください</p>
         <div className={css({ display: "flex", flexDir: "column", gap: 2 })}>
-          <Button
-            color={"secondary"}
-            className={css({
-              alignSelf: "center",
-              display: "flex",
-              alignItems: "flex-end",
-              gap: 2,
-              _disabled: {
-                opacity: 0.5,
-                cursor: "default",
-                "&:hover": { opacity: 0.5 },
-              },
-            })}
+          <button
+            className={cx(
+              buttonStyle({ visual: "outline", color: "purple" }),
+              css({
+                alignSelf: "center",
+                display: "flex!",
+                alignItems: "flex-end",
+                gap: 2,
+                _disabled: {
+                  opacity: 0.5,
+                  cursor: "default",
+                  "&:hover": { opacity: 0.5 },
+                },
+              }),
+            )}
             onClick={handleResend}
             disabled={isSent}>
             <span>確認メールを再送する</span>
             <Image src={SendButton} alt="" width={20} height={20} />
-          </Button>
+          </button>
           {isSent && (
             <p className={css({ color: "gray.700", fontSize: "sm" })}>
               確認メールを再送しました
diff --git a/src/common_components/auth/resetPassword/ResetPassword.tsx b/src/common_components/auth/resetPassword/ResetPassword.tsx
new file mode 100644
index 00000000..f8a7343a
--- /dev/null
+++ b/src/common_components/auth/resetPassword/ResetPassword.tsx
@@ -0,0 +1,104 @@
+import { basicErrorMessageStyle, basicFormStyle } from "@/common_components/formFields/styles";
+import { buttonStyle } from "@/recipes/button";
+import { css, cx } from "@styled-system/css";
+import { center, vstack } from "@styled-system/patterns";
+import { getAuth, sendPasswordResetEmail } from "firebase/auth";
+import { useState } from "react";
+import { useForm } from "react-hook-form";
+import toast from "react-hot-toast";
+import Image from "next/image";
+import Triangle from "@/assets/Triangle.svg?url";
+import { useSetAtom } from "jotai";
+import { authModeAtom } from "@/common_components/auth/AuthUI";
+const ResetPasswordForm: React.FC = () => {
+  const {
+    register,
+    handleSubmit,
+    formState: { errors },
+  } = useForm<{ email: string }>();
+  const [isSent, setIsSent] = useState(false);
+  const onSubmit = (data: { email: string }) => {
+    toast.promise(sendPasswordResetEmail(getAuth(), data.email), {
+      loading: "メールを送信しています",
+      success: () => {
+        setIsSent(true);
+        return "メールを送信しました";
+      },
+      error: "メールの送信に失敗しました",
+    });
+  };
+  return (
+    <form onSubmit={handleSubmit(onSubmit)} className={vstack({ justifyContent: "center", gap: 3, width: 72 })}>
+      <label className={css({ width: "full" })}>
+        <span className={css({ fontWeight: "bold" })}>メールアドレス</span>
+        <input
+          type="email"
+          className={cx(basicFormStyle(), css({ width: "full" }))}
+          aria-invalid={errors.email ? "true" : "false"}
+          placeholder="xxxxxx@xxxx.tsukuba.ac.jp"
+          {...register("email", {
+            required: "メールアドレスを入力してください",
+            pattern: {
+              value: /.*@.*\.tsukuba\.ac\.jp$/,
+              message: "筑波大学のメールアドレスを入力してください",
+            },
+          })}
+        />
+        {errors.email && <span className={basicErrorMessageStyle}>{errors.email.message}</span>}
+        {errors.root && <span className={basicErrorMessageStyle}>{errors.root.message}</span>}
+      </label>
+      <button
+        type="submit"
+        disabled={isSent}
+        className={cx(
+          buttonStyle({ visual: "solid", color: "purple" }),
+          css({
+            _disabled: {
+              opacity: 0.5,
+              cursor: "default",
+              "&:hover": { opacity: 0.5 },
+            },
+          }),
+        )}>
+        送信
+      </button>
+      {isSent && <p className={css({ textAlign: "center" })}>メールを送信しました。受信トレイをご確認ください</p>}
+    </form>
+  );
+};
+
+export const ResetPassword: React.FC = () => {
+  const setAuthMode = useSetAtom(authModeAtom);
+  return (
+    <div
+      className={center({
+        minHeight: "calc(100vh - token(spacing.20))",
+      })}>
+      <main
+        className={vstack({
+          boxShadow: "token(shadows.md)",
+          paddingY: 11,
+          paddingX: 20,
+          borderRadius: "token(xl)",
+          width: "fit-content",
+          verticalAlign: "center",
+          maxWidth: "90%",
+        })}>
+        <h1 className={css({ fontSize: "2xl", fontWeight: "bold", marginBottom: 8 })}>パスワードのリセット</h1>
+        <ResetPasswordForm />
+        <div className={css({ marginTop: 4, display: "flex", gap: 3.5 })}>
+          <Image src={Triangle} alt="" />
+          <button
+            onClick={() => setAuthMode("signIn")}
+            className={css({
+              textDecoration: "underline",
+              fontWeight: "bold",
+              cursor: "pointer",
+            })}>
+            サインイン
+          </button>
+        </div>
+      </main>
+    </div>
+  );
+};
diff --git a/src/common_components/auth/signin/SignInPage.tsx b/src/common_components/auth/signin/SignInPage.tsx
index 32644662..f6751800 100644
--- a/src/common_components/auth/signin/SignInPage.tsx
+++ b/src/common_components/auth/signin/SignInPage.tsx
@@ -5,7 +5,7 @@ import { useForm } from "react-hook-form";
 import toast from "react-hot-toast";
 import { css, cx } from "@styled-system/css";
 import { basicErrorMessageStyle, basicFormStyle } from "@/common_components/formFields/styles";
-import { Button } from "@/common_components/Button";
+import { buttonStyle } from "@/recipes/button";
 
 type SignInInput = { email: string; password: string };
 
@@ -88,9 +88,17 @@ export const SigninForm: React.FC = () => {
           {errors.password && <span className={basicErrorMessageStyle}>{errors.password.message}</span>}
           {errors.root && <span className={basicErrorMessageStyle}>{errors.root.message}</span>}
         </div>
-        <Button type="submit" color="purple" className={css({ flexGrow: 0, alignSelf: "center" })}>
+        <button
+          type="submit"
+          className={cx(
+            buttonStyle({
+              color: "purple",
+              visual: "solid",
+            }),
+            css({ flexGrow: 0, alignSelf: "center" }),
+          )}>
           送信
-        </Button>
+        </button>
       </form>
     </>
   );
diff --git a/src/common_components/auth/signin/page.tsx b/src/common_components/auth/signin/page.tsx
index f09f77af..99424a57 100644
--- a/src/common_components/auth/signin/page.tsx
+++ b/src/common_components/auth/signin/page.tsx
@@ -7,7 +7,7 @@ import Image from "next/image";
 import Triangle from "@/assets/Triangle.svg?url";
 import { authModeAtom } from "@/common_components/auth/AuthUI";
 import { useSetAtom } from "jotai";
-import { center } from "@styled-system/patterns";
+import { center, vstack } from "@styled-system/patterns";
 
 const SigninPage: NextPage = () => {
   const setAuthMode = useSetAtom(authModeAtom);
@@ -18,10 +18,7 @@ const SigninPage: NextPage = () => {
         minHeight: "calc(100vh - token(spacing.20))",
       })}>
       <div
-        className={css({
-          display: "flex",
-          flexDir: "column",
-          alignItems: "center",
+        className={vstack({
           boxShadow: "token(shadows.md)",
           paddingY: 11,
           paddingX: 20,
@@ -29,9 +26,24 @@ const SigninPage: NextPage = () => {
           width: "fit-content",
           maxWidth: "90%",
         })}>
-        <h1 className={css({ fontSize: "2xl", fontWeight: "bold", marginBottom: 8 })}>ログイン</h1>
+        <h1 className={css({ fontSize: "2xl", fontWeight: "bold", marginBottom: 8 })}>サインイン</h1>
         <SigninForm />
-        <div className={css({ marginTop: 4, display: "flex", gap: 3.5 })}>
+        <div className={css({ display: "flex", gap: 3.5 })}>
+          <Image src={Triangle} alt="" />
+          <button
+            onClick={() => setAuthMode("resetPassword")}
+            className={css({
+              textDecoration: "underline",
+              fontWeight: "bold",
+              cursor: "pointer",
+              wordBreak: "auto-phrase",
+            })}>
+            パスワードを忘れた場合
+            <wbr />
+            はこちら
+          </button>
+        </div>
+        <div className={css({ display: "flex", gap: 3.5 })}>
           <Image src={Triangle} alt="" />
           <button
             onClick={() => setAuthMode("signUp")}
diff --git a/src/common_components/header/Header.tsx b/src/common_components/header/Header.tsx
index e62c482d..5bf12f39 100644
--- a/src/common_components/header/Header.tsx
+++ b/src/common_components/header/Header.tsx
@@ -121,7 +121,7 @@ export const Header: FC = () => {
     : [
         {
           path: "/register",
-          name: "ログイン/新規登録",
+          name: "サインイン/新規登録",
         } as MenuData,
       ];
 
@@ -291,7 +291,7 @@ export const Header: FC = () => {
                 borderX: "solid 1px token(colors.gray.200)",
                 display: { base: "none", lg: "block" },
               })}>
-              ログイン/新規登録
+              サインイン/新規登録
             </button>
           </nav>
         )}