diff --git a/webapp/api/oauth/_middleware.ts b/webapp/api/oauth/_middleware.ts
new file mode 100644
index 0000000..a857f71
--- /dev/null
+++ b/webapp/api/oauth/_middleware.ts
@@ -0,0 +1,39 @@
+import { MiddlewareHandler } from 'hono'
+import { HonoEnv } from 'load-context'
+
+const AUTHORIZATION_REGEX = /^Bearer (.+)$/
+
+export const authMiddleware: MiddlewareHandler<HonoEnv> = async (c, next) => {
+  const authorization = c.req.header('Authroization')
+  const accessToken = authorization?.match(AUTHORIZATION_REGEX)?.[1]
+  if (!accessToken) {
+    return c.text('Unauthorized', 401)
+  }
+
+  const nowUnixMs = Date.now()
+  const nowDate = new Date(nowUnixMs)
+
+  const tokenInfo = await c.var.dbClient.query.token.findFirst({
+    where: (token, { eq, and, gt }) =>
+      and(
+        eq(token.access_token, accessToken),
+        gt(token.code_expires_at, nowDate),
+      ),
+    with: {
+      client: true,
+      scopes: {
+        with: {
+          scope: true,
+        },
+      },
+    },
+  })
+
+  if (!tokenInfo) {
+    return c.text('Unauthorized', 401)
+  }
+
+  c.set('tokenInfo', tokenInfo)
+
+  await next()
+}
diff --git a/webapp/api/oauth/verifyToken.ts b/webapp/api/oauth/verifyToken.ts
index 7710439..6f00688 100644
--- a/webapp/api/oauth/verifyToken.ts
+++ b/webapp/api/oauth/verifyToken.ts
@@ -1,11 +1,11 @@
-import { zValidator } from '@hono/zod-validator'
 import { Hono } from 'hono'
-import { z } from 'zod'
 
 import { READ_SCOPES } from '../../constants/scope'
 import { HonoEnv } from '../../load-context'
 import { IUserInfo } from '../../repository/idp'
 
+import { authMiddleware } from './_middleware'
+
 const app = new Hono<HonoEnv>()
 
 // 仕様はここ参照: https://github.com/saitamau-maximum/auth/issues/43
@@ -41,64 +41,32 @@ const INVALID_REQUEST_RESPONSE: InvalidResponseType = {
   scopes: null,
 }
 
-app.post(
-  '/',
-  zValidator(
-    'form',
-    z.object({
-      access_token: z.string(),
-    }),
-    async (res, c) => {
-      if (!res.success)
-        return c.json<InvalidResponseType>(INVALID_REQUEST_RESPONSE, 400)
-    },
-  ),
-  async c => {
-    const { access_token } = c.req.valid('form')
-
-    const nowUnixMs = Date.now()
-    const nowDate = new Date(nowUnixMs)
+app.get('/', authMiddleware, async c => {
+  const tokenInfo = c.var.tokenInfo
 
-    const tokenInfo = await c.var.dbClient.query.token.findFirst({
-      where: (token, { eq, and, gt }) =>
-        and(
-          eq(token.access_token, access_token),
-          gt(token.code_expires_at, nowDate),
-        ),
-      with: {
-        client: true,
-        scopes: {
-          with: {
-            scope: true,
-          },
-        },
-      },
-    })
+  c.header('Cache-Control', 'no-store')
+  c.header('Pragma', 'no-cache')
 
-    c.header('Cache-Control', 'no-store')
-    c.header('Pragma', 'no-cache')
-
-    // Token が見つからない場合
-    if (!tokenInfo) {
-      return c.json<InvalidResponseType>(INVALID_REQUEST_RESPONSE, 404)
-    }
+  // Token が見つからない場合
+  if (!tokenInfo) {
+    return c.json<InvalidResponseType>(INVALID_REQUEST_RESPONSE, 404)
+  }
 
-    const res: ValidResponseType = {
-      valid: true,
-      client: tokenInfo.client,
-      user_id: tokenInfo.user_id,
-      expires_at: tokenInfo.access_token_expires_at.getTime(),
-      scopes: tokenInfo.scopes.map(s => s.scope.name),
-    }
+  const res: ValidResponseType = {
+    valid: true,
+    client: tokenInfo.client,
+    user_id: tokenInfo.user_id,
+    expires_at: tokenInfo.access_token_expires_at.getTime(),
+    scopes: tokenInfo.scopes.map(s => s.scope.name),
+  }
 
-    if (res.scopes.includes(READ_SCOPES.BASIC_INFO)) {
-      const user = await c.var.idpClient.findUserById(res.user_id)
-      if (user) res.user_info = user
-    }
+  if (res.scopes.includes(READ_SCOPES.BASIC_INFO)) {
+    const user = await c.var.idpClient.findUserById(res.user_id)
+    if (user) res.user_info = user
+  }
 
-    return c.json<ValidResponseType>(res)
-  },
-)
+  return c.json<ValidResponseType>(res)
+})
 
 // POST 以外は許容しない
 app.all('/', async c => {
diff --git a/webapp/load-context.ts b/webapp/load-context.ts
index 50a9c29..fbcf218 100644
--- a/webapp/load-context.ts
+++ b/webapp/load-context.ts
@@ -1,3 +1,4 @@
+import { InferSelectModel } from 'drizzle-orm'
 import { DrizzleD1Database } from 'drizzle-orm/d1'
 import { type PlatformProxy } from 'wrangler'
 
@@ -22,6 +23,12 @@ export interface HonoEnv {
   Variables: {
     dbClient: DrizzleD1Database<typeof schema>
     idpClient: IdpRepository
+    tokenInfo: InferSelectModel<typeof schema.token> & {
+      client: InferSelectModel<typeof schema.client>
+      scopes: (InferSelectModel<typeof schema.tokenScope> & {
+        scope: InferSelectModel<typeof schema.scope>
+      })[]
+    }
   }
 }