diff --git a/backend/controllers/friends_controller.go b/backend/controllers/friends_controller.go
new file mode 100644
index 0000000..fa685c1
--- /dev/null
+++ b/backend/controllers/friends_controller.go
@@ -0,0 +1,29 @@
+package controllers
+
+import (
+	"github.com/gin-gonic/gin"
+	"net/http"
+)
+
+// FriendsController is a struct to define the friends controller
+type FriendsController struct {
+}
+
+// NewFriendsController is a function to create a new friends controller
+func NewFriendsController() *FriendsController {
+	return &FriendsController{}
+}
+
+
+// GetFriendsResponse is a struct to define the get friends response
+type GetFriendsResponse struct {
+	Message string `json:"message"`
+}
+
+// GetFriends is a function to handle the get friends request
+func (controller *FriendsController) GetFriends(c *gin.Context) {
+
+	var response GetFriendsResponse
+	response.Message = "Get friends successful"
+	c.JSON(http.StatusOK, response)
+}
diff --git a/backend/controllers/login_controller.go b/backend/controllers/login_controller.go
new file mode 100644
index 0000000..8447600
--- /dev/null
+++ b/backend/controllers/login_controller.go
@@ -0,0 +1,38 @@
+package controllers
+
+import (
+	"github.com/gin-gonic/gin"
+	"net/http"
+)
+
+// LoginController is a struct to define the login controller
+type LoginController struct {
+}
+
+// NewLoginController is a function to create a new login controller
+func NewLoginController() *LoginController {
+	return &LoginController{}
+}
+
+// LoginRequest is a struct to define the login request
+type LoginRequest struct {
+	Message string `json:"message" binding:"required"`
+}
+
+// LoginResponse is a struct to define the login response
+type LoginResponse struct {
+	Message string `json:"message"`
+}
+
+// Login is a function to handle the login request
+func (controller *LoginController) Login(c *gin.Context) {
+	var request LoginRequest
+	if err := c.ShouldBindJSON(&request); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	var response LoginResponse
+	response.Message = "Login successful"
+	c.JSON(http.StatusOK, response)
+}
\ No newline at end of file
diff --git a/backend/go.mod b/backend/go.mod
index a37ae39..ca200dd 100644
--- a/backend/go.mod
+++ b/backend/go.mod
@@ -1,4 +1,4 @@
-module sample
+module gomoku
 
 go 1.22.6
 
diff --git a/backend/main.go b/backend/main.go
index 003efd7..16c260d 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -1,18 +1,10 @@
 package main
 
 import (
-	"net/http"
-	"github.com/gin-gonic/gin"
-	_ "github.com/lib/pq"	
+	"gomoku/routes"
 )
 
 func main() {
-	r := gin.Default()
-  
-	r.GET("/", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
-			"message": "Hello World",
-		})
-	})
-	r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
+	router := routes.GetRouter()
+	router.Run(":8080")
 }
diff --git a/backend/models/database/database.go b/backend/models/database/database.go
new file mode 100644
index 0000000..9ff732a
--- /dev/null
+++ b/backend/models/database/database.go
@@ -0,0 +1,10 @@
+package database
+
+import (
+	"gorm.io/gorm"
+)
+
+// Database struct
+type Database struct {
+	*gorm.DB
+}
diff --git a/backend/models/friend.go b/backend/models/friend.go
new file mode 100644
index 0000000..8459720
--- /dev/null
+++ b/backend/models/friend.go
@@ -0,0 +1,11 @@
+package models
+
+import (
+	"gorm.io/gorm"
+)
+
+// Friend struct
+type Friend struct {
+	gorm.Model
+}
+
diff --git a/backend/models/user.go b/backend/models/user.go
new file mode 100644
index 0000000..a40a8ca
--- /dev/null
+++ b/backend/models/user.go
@@ -0,0 +1,10 @@
+package models
+
+import (
+	"gorm.io/gorm"
+)
+
+// User struct
+type User struct {
+	gorm.Model
+}
\ No newline at end of file
diff --git a/backend/routes/router.go b/backend/routes/router.go
new file mode 100644
index 0000000..f611646
--- /dev/null
+++ b/backend/routes/router.go
@@ -0,0 +1,27 @@
+package routes
+
+import (
+	"github.com/gin-gonic/gin"
+	"gomoku/controllers"
+)
+
+func GetRouter() *gin.Engine {
+	router := gin.Default()
+
+	api := router.Group("/api/v1")
+	{
+		users := api.Group("/users")
+		{
+			loginController := controllers.NewLoginController()
+			users.POST("/login", loginController.Login)
+		}
+
+		friends := api.Group("/friends")
+		{
+			friendsController := controllers.NewFriendsController()
+			friends.GET("/", friendsController.GetFriends)
+		}
+	}
+
+	return router
+}
\ No newline at end of file
diff --git a/docs/02.Backend/00.DirStructure/README.md b/docs/02.Backend/00.DirStructure/README.md
index 151b177..ed63b9f 100644
--- a/docs/02.Backend/00.DirStructure/README.md
+++ b/docs/02.Backend/00.DirStructure/README.md
@@ -1 +1,34 @@
 # 00.DirStructure
+
+バックエンドのディレクトリ構造は以下のようになっている。
+
+```bash
+backend/
+├── Dockerfile
+├── README.md
+├── controllers
+├── go.mod
+├── go.sum
+├── main.go
+├── middleware
+├── models
+│   └── database
+└── routes
+```
+
+1. **Dockerfile**: バックエンドイメージをビルドするためのDockerfile
+2. **README.md**: このファイル
+3. **controllers**: バックエンドのコントローラー
+4. **go.mod**: Goモジュールファイル
+5. **go.sum**: Goのサムファイル
+6. **main.go**: バックエンドのエントリーポイント
+7. **middleware**: バックエンドのミドルウェア（現状空の為、git未追跡）
+8. **models**: バックエンドのモデル
+    - **database**: 
+9.  **routes**: バックエンドのルート
+10. **tmp**: Airによって作成されたバックエンドの一時ディレクトリ
+
+
+基本的にMVC(Model-View-Controller)パターンに従ってディレクトリ構造を設計している。
+開発者のレベルを考慮し、分かりやすいアーキテクチャを選択した。
+現状バックエンドは単にAPIサーバーとしての機能しか持たない予定のため、Viewは存在しない。