diff --git a/packages/react/src/components/DropdownSelector/DropdownPopover.tsx b/packages/react/src/components/DropdownSelector/DropdownPopover.tsx
index 5dbffcda5..5a19a903e 100644
--- a/packages/react/src/components/DropdownSelector/DropdownPopover.tsx
+++ b/packages/react/src/components/DropdownSelector/DropdownPopover.tsx
@@ -26,7 +26,6 @@ export function DropdownPopover({ children, ...props }: DropdownPopoverProps) {
       const selectedElement = document.querySelector(
         `[data-key="${props.value.toString()}"]`
       ) as HTMLElement | undefined
-      selectedElement?.scrollIntoView({ block: 'center' })
       selectedElement?.focus()
       window.scrollTo(windowScrollX, windowScrollY)
     }
diff --git a/packages/react/src/components/DropdownSelector/Popover/index.tsx b/packages/react/src/components/DropdownSelector/Popover/index.tsx
index 1fa36c8f3..1a3780ef7 100644
--- a/packages/react/src/components/DropdownSelector/Popover/index.tsx
+++ b/packages/react/src/components/DropdownSelector/Popover/index.tsx
@@ -1,8 +1,10 @@
-import { RefObject, useRef } from 'react'
+import { RefObject, useContext, useRef } from 'react'
 import { ReactNode } from 'react'
 import { DismissButton, Overlay, usePopover } from '@react-aria/overlays'
 import styled from 'styled-components'
 import { theme } from '../../../styled'
+import { ModalBackgroundContext } from '../../Modal/ModalBackgroundContext'
+import { usePreventScroll } from './usePreventScroll'
 
 export type PopoverProps = {
   isOpen: boolean
@@ -40,11 +42,24 @@ export default function Popover(props: PopoverProps) {
     }
   )
 
+  const modalBackground = useContext(ModalBackgroundContext)
+  usePreventScroll(modalBackground, props.isOpen)
+
   if (!props.isOpen) return null
 
   return (
     <Overlay portalContainer={document.body}>
-      <div {...underlayProps} style={{ position: 'fixed', inset: 0 }} />
+      <div
+        {...underlayProps}
+        style={{
+          position: 'fixed',
+          zIndex:
+            typeof popoverProps.style?.zIndex === 'number'
+              ? popoverProps.style.zIndex - 1
+              : 99999,
+          inset: 0,
+        }}
+      />
       <DropdownPopoverDiv {...popoverProps} ref={finalPopoverRef}>
         <DismissButton onDismiss={() => props.onClose()} />
         {props.children}
diff --git a/packages/react/src/components/DropdownSelector/Popover/usePreventScroll.tsx b/packages/react/src/components/DropdownSelector/Popover/usePreventScroll.tsx
new file mode 100644
index 000000000..1c3cb9891
--- /dev/null
+++ b/packages/react/src/components/DropdownSelector/Popover/usePreventScroll.tsx
@@ -0,0 +1,18 @@
+import { useEffect } from 'react'
+
+export function usePreventScroll(element: HTMLElement | null, isOpen: boolean) {
+  useEffect(() => {
+    if (isOpen && element) {
+      const defaultPaddingRight = element.style.paddingRight
+      const defaultOverflow = element.style.overflow
+      element.style.paddingRight = `${
+        window.innerWidth - element.clientWidth
+      }px`
+      element.style.overflow = 'hidden'
+      return () => {
+        element.style.paddingRight = defaultPaddingRight
+        element.style.overflow = defaultOverflow
+      }
+    }
+  }, [element, isOpen])
+}
diff --git a/packages/react/src/components/DropdownSelector/index.story.tsx b/packages/react/src/components/DropdownSelector/index.story.tsx
index 415898351..2931ed778 100644
--- a/packages/react/src/components/DropdownSelector/index.story.tsx
+++ b/packages/react/src/components/DropdownSelector/index.story.tsx
@@ -4,6 +4,10 @@ import { Story } from '../../_lib/compat'
 import { Divider } from './Divider'
 import MenuItemGroup from './MenuItemGroup'
 import DropdownMenuItem from './DropdownMenuItem'
+import Modal from '../Modal'
+import { ModalBody, ModalHeader } from '../Modal/ModalPlumbing'
+import styled from 'styled-components'
+import Button from '../Button'
 
 export default {
   title: 'DropdownSelector',
@@ -26,6 +30,7 @@ export const Playground: Story<DropdownSelectorProps> = (
   const [selected, setSelected] = useState('50')
   return (
     <div style={{ width: 288 }}>
+      <Button></Button>
       <DropdownSelector
         {...props}
         onChange={(value) => {
@@ -51,27 +56,78 @@ Playground.args = { ...baseProps }
 export const Basic: Story<DropdownSelectorProps> = (
   props: DropdownSelectorProps
 ) => {
-  const [selected, setSelected] = useState('')
   return (
     <div style={{ width: 288 }}>
-      <DropdownSelector
-        {...props}
-        onChange={(value) => {
-          setSelected(value)
-        }}
-        value={selected}
-        label="label"
-      >
-        <DropdownMenuItem value={'10'}>Apple</DropdownMenuItem>
-        <DropdownMenuItem value={'20'}>Banana</DropdownMenuItem>
-        <DropdownMenuItem value={'30'}>Orange</DropdownMenuItem>
-      </DropdownSelector>
+      <PlaygroundDropdownSelector {...props} />
     </div>
   )
 }
 
 Basic.args = { ...baseProps }
 
+function PlaygroundDropdownSelector(props: Partial<DropdownSelectorProps>) {
+  const [selected, setSelected] = useState('10')
+  return (
+    <DropdownSelector
+      {...props}
+      onChange={(value) => {
+        setSelected(value)
+      }}
+      value={selected}
+      label="label"
+    >
+      <DropdownMenuItem value={'10'}>Apple</DropdownMenuItem>
+      <DropdownMenuItem value={'20'}>Banana</DropdownMenuItem>
+      <DropdownMenuItem value={'30'}>Orange</DropdownMenuItem>
+    </DropdownSelector>
+  )
+}
+
+const DummyBox = styled.div`
+  border: solid 1px ${({ theme }) => theme.border.default.color};
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 256px;
+`
+
+export const InModal: Story<DropdownSelectorProps> = () => {
+  const [open, setOpen] = useState(true)
+  return (
+    <div
+      style={{
+        height: '10px',
+      }}
+    >
+      <button onClick={() => setOpen(true)}>open</button>
+      <Modal
+        bottomSheet="full"
+        title="modal"
+        isOpen={open}
+        isDismissable
+        onClose={() => {
+          setOpen(false)
+        }}
+      >
+        <ModalHeader />
+        <ModalBody>
+          <div
+            style={{
+              padding: '16px',
+            }}
+          >
+            <DummyBox>256px</DummyBox>
+            <PlaygroundDropdownSelector />
+            <DummyBox>256px</DummyBox>
+            <PlaygroundDropdownSelector />
+            <DummyBox>256px</DummyBox>
+          </div>
+        </ModalBody>
+      </Modal>
+    </div>
+  )
+}
+
 export const InFormTag: Story<DropdownSelectorProps> = (
   props: DropdownSelectorProps
 ) => {
diff --git a/packages/react/src/components/Modal/ModalBackgroundContext.tsx b/packages/react/src/components/Modal/ModalBackgroundContext.tsx
new file mode 100644
index 000000000..3a8f0a752
--- /dev/null
+++ b/packages/react/src/components/Modal/ModalBackgroundContext.tsx
@@ -0,0 +1,8 @@
+import * as React from 'react'
+
+/**
+ * ModalBackgroundのElementが入ったコンテキスト
+ */
+export const ModalBackgroundContext = React.createContext<HTMLElement | null>(
+  null
+)
diff --git a/packages/react/src/components/Modal/index.story.tsx b/packages/react/src/components/Modal/index.story.tsx
index 947fefb57..31fe9b9d8 100644
--- a/packages/react/src/components/Modal/index.story.tsx
+++ b/packages/react/src/components/Modal/index.story.tsx
@@ -12,6 +12,8 @@ import {
 import styled from 'styled-components'
 import { theme } from '../../styled'
 import TextField from '../TextField'
+import DropdownSelector from '../DropdownSelector'
+import DropdownMenuItem from '../DropdownSelector/DropdownMenuItem'
 
 export default {
   title: 'Modal',
@@ -75,6 +77,19 @@ const M = (props: ModalProps) => {
               placeholder="Tokyo"
             ></TextField>
           </ModalAlign>
+          <ModalAlign>
+            <DropdownSelector
+              onChange={() => null}
+              value="10"
+              showLabel
+              label="Fruits"
+              placeholder="Apple"
+            >
+              <DropdownMenuItem value={'10'}>Apple</DropdownMenuItem>
+              <DropdownMenuItem value={'20'}>Banana</DropdownMenuItem>
+              <DropdownMenuItem value={'30'}>Orange</DropdownMenuItem>
+            </DropdownSelector>
+          </ModalAlign>
         </ModalVStack>
         <ModalButtons>
           <Button variant="Primary" onClick={() => props.onClose()} fullWidth>
diff --git a/packages/react/src/components/Modal/index.tsx b/packages/react/src/components/Modal/index.tsx
index ca278138e..c24a4d1e5 100644
--- a/packages/react/src/components/Modal/index.tsx
+++ b/packages/react/src/components/Modal/index.tsx
@@ -17,6 +17,7 @@ import { animated, useTransition, easings } from 'react-spring'
 import Button, { ButtonProps } from '../Button'
 import IconButton from '../IconButton'
 import { useObjectRef } from '@react-aria/utils'
+import { ModalBackgroundContext } from './ModalBackgroundContext'
 
 export type BottomSheet = boolean | 'full'
 type Size = 'S' | 'M' | 'L'
@@ -131,50 +132,54 @@ const Modal = forwardRef<HTMLDivElement, ModalProps>(function ModalInner(
       : { duration: 0 },
   })
 
-  return transition(({ backgroundColor, transform, overflow }, item) => {
-    return (
+  const bgRef = React.useRef<HTMLElement>(null)
+
+  return transition(
+    ({ backgroundColor, overflow, transform }, item) =>
       item && (
         <Overlay portalContainer={portalContainer}>
           <ModalBackground
+            ref={bgRef}
             zIndex={zIndex}
             {...underlayProps}
             style={transitionEnabled ? { backgroundColor, overflow } : {}}
             $bottomSheet={bottomSheet}
           >
-            <ModalDialog
-              ref={ref}
-              {...modalProps}
-              style={transitionEnabled ? { transform } : {}}
-              size={size}
-              bottomSheet={bottomSheet}
-              className={className}
-            >
-              <Dialog>
-                <ModalContext.Provider
-                  value={{
-                    titleProps: {},
-                    title,
-                    close: onClose,
-                    showDismiss,
-                    bottomSheet,
-                  }}
-                >
-                  {children}
-                  {isDismissable === true && (
-                    <ModalCrossButton
-                      size="S"
-                      icon="24/Close"
-                      onClick={onClose}
-                    />
-                  )}
-                </ModalContext.Provider>
-              </Dialog>
-            </ModalDialog>
+            <ModalBackgroundContext.Provider value={bgRef.current}>
+              <ModalDialog
+                ref={ref}
+                {...modalProps}
+                style={transitionEnabled ? { transform } : {}}
+                size={size}
+                bottomSheet={bottomSheet}
+                className={className}
+              >
+                <Dialog>
+                  <ModalContext.Provider
+                    value={{
+                      titleProps: {},
+                      title,
+                      close: onClose,
+                      showDismiss,
+                      bottomSheet,
+                    }}
+                  >
+                    {children}
+                    {isDismissable === true && (
+                      <ModalCrossButton
+                        size="S"
+                        icon="24/Close"
+                        onClick={onClose}
+                      />
+                    )}
+                  </ModalContext.Provider>
+                </Dialog>
+              </ModalDialog>
+            </ModalBackgroundContext.Provider>
           </ModalBackground>
         </Overlay>
       )
-    )
-  })
+  )
 })
 
 export default memo(Modal)
@@ -217,7 +222,8 @@ const ModalBackground = animated(styled.div<{
   position: fixed;
   top: 0;
   left: 0;
-  width: 100%;
+  width: -webkit-fill-available;
+  width: -moz-available;
   height: 100%;
   justify-content: center;
   padding: 40px 0;