diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index eb237a3..3a65063 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -32,6 +32,7 @@ module.exports = {
         semi: false,
       },
     ],
+    'no-case-declarations': 'off',
   },
   parser: 'vue-eslint-parser',
   parserOptions: {
diff --git a/package.json b/package.json
index 97d746f..e1fc8dc 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc && vite build",
+    "build:prod": "export NODE_ENV=production && vue-tsc && vite build",
     "preview": "vite preview",
     "lint": "eslint src --ext .js,.ts,.vue",
     "gen-api": "node ./scripts/gen-api.js",
diff --git a/src/lib/apis/index.ts b/src/lib/apis/index.ts
index c1b0fc8..b224473 100644
--- a/src/lib/apis/index.ts
+++ b/src/lib/apis/index.ts
@@ -3,7 +3,7 @@ import { Apis, Configuration } from './generated'
 const api = new Apis(
   new Configuration({
     basePath:
-      import.meta.env.MODE === 'production'
+      process.env.NODE_ENV === 'production'
         ? 'https://trap.show/h24s_19_server'
         : 'http://localhost:3000',
   }),
diff --git a/src/stores/individualRoom.ts b/src/stores/individualRoom.ts
new file mode 100644
index 0000000..bf9172f
--- /dev/null
+++ b/src/stores/individualRoom.ts
@@ -0,0 +1,154 @@
+import { ref } from 'vue'
+import { defineStore } from 'pinia'
+
+type IndividualRoomState =
+  | {
+      ws: null
+    }
+  | {
+      ws: WebSocket
+      roomId: string
+      posts: Post[]
+      rejectedPosts: RejectedPostResponse[]
+    }
+
+interface BasicPost {
+  wordId: number
+  word: string
+  reading: string
+  basicScore: number
+  senderId: string
+  senderName: string
+}
+
+export interface Post extends BasicPost {
+  additionalScore: number
+  totalScore: number
+  isInvalid: boolean
+}
+
+interface RejectedPostResponse {
+  type: 'post_word_rejected'
+  word: string
+  reading: string
+}
+
+interface PostedWord extends BasicPost {
+  type: 'posted_word'
+}
+
+interface ScoreChangeResponse {
+  // いいねや通報で得点が変動した時
+  type: 'score_change'
+  wordId: number
+  additionalScore: number
+  basicScore: number
+  totalScore: number
+  isInvalid: boolean
+}
+
+type WebSocketResponse = PostedWord | RejectedPostResponse | ScoreChangeResponse
+
+const BASE_URL =
+  process.env.NODE_ENV === 'production'
+    ? 'wss://trap.show/h24s_19_server'
+    : 'ws://localhost:3000'
+const websocketUrl = (roomId: string) => `${BASE_URL}/api/ws/${roomId}`
+
+export const useIndividualRoom = defineStore('individualRoom', () => {
+  const state = ref<IndividualRoomState>({
+    ws: null,
+  })
+
+  const connect = (roomId: string) => {
+    const ws = new WebSocket(websocketUrl(roomId))
+    ws.onopen = () => {
+      console.log('connected')
+      state.value = { ws, roomId, posts: [], rejectedPosts: [] }
+    }
+
+    ws.onclose = () => {
+      console.log('disconnected')
+      state.value = { ws: null }
+    }
+
+    ws.onmessage = (event) => {
+      if (state.value.ws === null) {
+        throw new Error('WebSocket is not connected')
+      }
+      console.log('message', event.data)
+
+      const data: WebSocketResponse = JSON.parse(event.data)
+      switch (data.type) {
+        case 'posted_word':
+          state.value.posts.push({
+            ...data,
+            additionalScore: 0,
+            totalScore: data.basicScore,
+            isInvalid: false,
+          })
+          break
+        case 'post_word_rejected':
+          state.value.rejectedPosts.push(data)
+          break
+        case 'score_change':
+          const post = state.value.posts.find(
+            (post) => post.wordId === data.wordId,
+          )
+          if (post === undefined) {
+            throw new Error('Post not found')
+          }
+          post.additionalScore = data.additionalScore
+          post.basicScore = data.basicScore
+          post.totalScore = data.totalScore
+          post.isInvalid = data.isInvalid
+          break
+        default:
+          throw new Error('Unknown message type')
+      }
+    }
+  }
+
+  const close = () => {
+    if (state.value.ws === null) {
+      throw new Error('WebSocket is not connected')
+    }
+    state.value.ws.close()
+  }
+
+  const sendPost = (word: string, reading: string) => {
+    if (state.value.ws === null) {
+      throw new Error('WebSocket is not connected')
+    }
+    state.value.ws.send(
+      JSON.stringify({ type: 'postWord', args: { word, reading } }),
+    )
+  }
+
+  const reportPost = (wordId: number) => {
+    if (state.value.ws === null) {
+      throw new Error('WebSocket is not connected')
+    }
+    state.value.ws.send(
+      JSON.stringify({ type: 'reportWord', args: { wordId } }),
+    )
+  }
+
+  const goodPost = (wordId: number, score: number) => {
+    if (state.value.ws === null) {
+      throw new Error('WebSocket is not connected')
+    }
+    state.value.ws.send(
+      JSON.stringify({ type: 'goodWord', args: { wordId, score } }),
+    )
+  }
+
+  return {
+    state,
+    connect,
+    close,
+    sendPost,
+    reportPost,
+    goodPost,
+  }
+})