diff --git a/build.gradle.kts b/build.gradle.kts
index bf3eafb9..c27ebaf6 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -93,6 +93,7 @@ dependencies {
 
     implementation("org.springframework.boot:spring-boot-starter-web")
     implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
     implementation("org.springframework.boot:spring-boot-starter-oauth2-authorization-server")
     implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server")
     implementation("jakarta.validation:jakarta.validation-api")
diff --git a/src/main/kotlin/dev/usbharu/hideout/config/SecurityConfig.kt b/src/main/kotlin/dev/usbharu/hideout/config/SecurityConfig.kt
index d4a8d4d1..95a2dc4c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/config/SecurityConfig.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/config/SecurityConfig.kt
@@ -72,6 +72,9 @@ class SecurityConfig {
                     builder.pattern("/error"),
                     builder.pattern("/nodeinfo/2.0")
                 ).permitAll()
+                it.requestMatchers(
+                    builder.pattern("/auth/**")
+                ).anonymous()
                 it.requestMatchers(builder.pattern("/change-password")).authenticated()
                 it.requestMatchers(builder.pattern("/api/v1/accounts/verify_credentials"))
                     .hasAnyAuthority("SCOPE_read", "SCOPE_read:accounts")
@@ -84,7 +87,6 @@ class SecurityConfig {
             .passwordManagement { }
             .formLogin(Customizer.withDefaults())
             .csrf {
-                it.ignoringRequestMatchers(builder.pattern("/api/**"))
                 it.ignoringRequestMatchers(builder.pattern("/users/*/inbox"))
                 it.ignoringRequestMatchers(builder.pattern("/inbox"))
                 it.ignoringRequestMatchers(PathRequest.toH2Console())
diff --git a/src/main/kotlin/dev/usbharu/hideout/controller/AuthController.kt b/src/main/kotlin/dev/usbharu/hideout/controller/AuthController.kt
new file mode 100644
index 00000000..c91b1f34
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/controller/AuthController.kt
@@ -0,0 +1,10 @@
+package dev.usbharu.hideout.controller
+
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.GetMapping
+
+@Controller
+class AuthController {
+    @GetMapping("/auth/sign_up")
+    fun signUp(): String = "sign_up"
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/controller/mastodon/MastodonAccountApiController.kt b/src/main/kotlin/dev/usbharu/hideout/controller/mastodon/MastodonAccountApiController.kt
index d6754a3d..290f2240 100644
--- a/src/main/kotlin/dev/usbharu/hideout/controller/mastodon/MastodonAccountApiController.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/controller/mastodon/MastodonAccountApiController.kt
@@ -2,16 +2,23 @@ package dev.usbharu.hideout.controller.mastodon
 
 import dev.usbharu.hideout.controller.mastodon.generated.AccountApi
 import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccount
+import dev.usbharu.hideout.domain.model.hideout.dto.UserCreateDto
 import dev.usbharu.hideout.service.api.mastodon.AccountApiService
+import dev.usbharu.hideout.service.core.Transaction
 import kotlinx.coroutines.runBlocking
+import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpStatus
 import org.springframework.http.ResponseEntity
 import org.springframework.security.core.context.SecurityContextHolder
 import org.springframework.security.oauth2.jwt.Jwt
 import org.springframework.stereotype.Controller
+import java.net.URI
 
 @Controller
-class MastodonAccountApiController(private val accountApiService: AccountApiService) : AccountApi {
+class MastodonAccountApiController(
+    private val accountApiService: AccountApiService,
+    private val transaction: Transaction
+) : AccountApi {
     override fun apiV1AccountsVerifyCredentialsGet(): ResponseEntity<CredentialAccount> = runBlocking {
         val principal = SecurityContextHolder.getContext().getAuthentication().principal as Jwt
 
@@ -20,4 +27,21 @@ class MastodonAccountApiController(private val accountApiService: AccountApiServ
             HttpStatus.OK
         )
     }
+
+    override fun apiV1AccountsPost(
+        username: String,
+        password: String,
+        email: String?,
+        agreement: Boolean?,
+        locale: Boolean?,
+        reason: String?
+    ): ResponseEntity<Unit> = runBlocking {
+        transaction.transaction {
+
+            accountApiService.registerAccount(UserCreateDto(username, username, "", password))
+        }
+        val httpHeaders = HttpHeaders()
+        httpHeaders.location = URI("/users/$username")
+        ResponseEntity(Unit, httpHeaders, HttpStatus.FOUND)
+    }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/api/mastodon/AccountApiService.kt b/src/main/kotlin/dev/usbharu/hideout/service/api/mastodon/AccountApiService.kt
index 45df785d..2eece508 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/api/mastodon/AccountApiService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/api/mastodon/AccountApiService.kt
@@ -4,23 +4,34 @@ import dev.usbharu.hideout.domain.mastodon.model.generated.Account
 import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccount
 import dev.usbharu.hideout.domain.mastodon.model.generated.CredentialAccountSource
 import dev.usbharu.hideout.domain.mastodon.model.generated.Role
+import dev.usbharu.hideout.domain.model.hideout.dto.UserCreateDto
 import dev.usbharu.hideout.service.core.Transaction
 import dev.usbharu.hideout.service.mastodon.AccountService
+import dev.usbharu.hideout.service.user.UserService
 import org.springframework.stereotype.Service
 
 @Service
 interface AccountApiService {
     suspend fun verifyCredentials(userid: Long): CredentialAccount
+    suspend fun registerAccount(userCreateDto: UserCreateDto): Unit
 }
 
 @Service
-class AccountApiServiceImpl(private val accountService: AccountService, private val transaction: Transaction) :
+class AccountApiServiceImpl(
+    private val accountService: AccountService,
+    private val transaction: Transaction,
+    private val userService: UserService
+) :
     AccountApiService {
     override suspend fun verifyCredentials(userid: Long): CredentialAccount = transaction.transaction {
         val account = accountService.findById(userid)
         from(account)
     }
 
+    override suspend fun registerAccount(userCreateDto: UserCreateDto) {
+        userService.createLocalUser(UserCreateDto(userCreateDto.name, userCreateDto.name, "", userCreateDto.password))
+    }
+
     private fun from(account: Account): CredentialAccount {
         return CredentialAccount(
             id = account.id,
diff --git a/src/main/resources/openapi/mastodon.yaml b/src/main/resources/openapi/mastodon.yaml
index 9b10b266..246a15a5 100644
--- a/src/main/resources/openapi/mastodon.yaml
+++ b/src/main/resources/openapi/mastodon.yaml
@@ -182,8 +182,57 @@ paths:
               schema:
                 $ref: "#/components/schemas/CredentialAccount"
 
+  /api/v1/accounts:
+    post:
+      tags:
+        - account
+      security:
+        - OAuth2:
+            - "write:accounts"
+      requestBody:
+        required: true
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              $ref: "#/components/schemas/AccountsCreateRequest"
+      responses:
+        200:
+          description: 成功
+
 components:
   schemas:
+    AccountsCreateRequest:
+      type: object
+      properties:
+        username:
+          type: string
+        email:
+          type: string
+        password:
+          type: string
+        agreement:
+          type: boolean
+        locale:
+          type: boolean
+        reason:
+          type: string
+      required:
+        - username
+        - password
+
+    Token:
+      type: object
+      properties:
+        access_token:
+          type: string
+        token_type:
+          type: string
+        scope:
+          type: string
+        created_at:
+          type: integer
+          format: int64
+
     Account:
       type: object
       properties:
diff --git a/src/main/resources/templates/sign_up.html b/src/main/resources/templates/sign_up.html
new file mode 100644
index 00000000..079fdd7c
--- /dev/null
+++ b/src/main/resources/templates/sign_up.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="ja" xmlns:th="http://www.thymeleaf.org">
+<head>
+    <meta charset="UTF-8">
+    <title>SignUp</title>
+</head>
+<body>
+
+<form method='post' th:action="@{/api/v1/accounts}">
+    <input name='username' type='text' value=''>
+    <input name='password' type='password'>
+    <input type="submit">
+</form>
+</body>
+</html>
diff --git a/src/test/kotlin/dev/usbharu/hideout/service/ap/APReceiveFollowServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/service/ap/APReceiveFollowServiceImplTest.kt
index 79c93816..9aebf1ee 100644
--- a/src/test/kotlin/dev/usbharu/hideout/service/ap/APReceiveFollowServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/service/ap/APReceiveFollowServiceImplTest.kt
@@ -36,7 +36,12 @@ class APReceiveFollowServiceImplTest {
         }
         val activityPubFollowService =
             APReceiveFollowServiceImpl(
-                jobQueueParentService, mock(), mock(), mock(), mock(), TestTransaction,
+                jobQueueParentService,
+                mock(),
+                mock(),
+                mock(),
+                mock(),
+                TestTransaction,
                 objectMapper
             )
         activityPubFollowService.receiveFollow(