diff --git a/packages/mottai_flutter_app/lib/chat/chat_room.dart b/packages/mottai_flutter_app/lib/chat/chat_room.dart
index 7851a7e6..38e5bda5 100644
--- a/packages/mottai_flutter_app/lib/chat/chat_room.dart
+++ b/packages/mottai_flutter_app/lib/chat/chat_room.dart
@@ -45,6 +45,7 @@ final chatRoomStateNotifierProvider = StateNotifierProvider.family
     .autoDispose<ChatRoomStateNotifier, ChatRoomState, String>(
   (ref, chatRoomId) => ChatRoomStateNotifier(
     chatRoomId: chatRoomId,
+    chatRoomRepository: ref.watch(chatRoomRepositoryProvider),
     chatMessageRepository: ref.watch(chatMessageRepositoryProvider),
   ),
 );
@@ -52,8 +53,10 @@ final chatRoomStateNotifierProvider = StateNotifierProvider.family
 class ChatRoomStateNotifier extends StateNotifier<ChatRoomState> {
   ChatRoomStateNotifier({
     required String chatRoomId,
+    required ChatRoomRepository chatRoomRepository,
     required ChatMessageRepository chatMessageRepository,
   })  : _chatRoomId = chatRoomId,
+        _chatRoomRepository = chatRoomRepository,
         _chatMessageRepository = chatMessageRepository,
         super(const ChatRoomState()) {
     _newReadChatMessagesSubscription = _chatMessageRepository
@@ -64,6 +67,7 @@ class ChatRoomStateNotifier extends StateNotifier<ChatRoomState> {
         .listen(_updateNewReadChatMessages);
     Future<void>(() async {
       await Future.wait<void>([
+        _fetchChatRoom(),
         loadMore(),
         // ChatPage に遷移直後のメッセージアイコンを意図的に見せるために最低でも 500 ms 待つ。
         Future<void>.delayed(const Duration(milliseconds: 500)),
@@ -78,10 +82,13 @@ class ChatRoomStateNotifier extends StateNotifier<ChatRoomState> {
     super.dispose();
   }
 
+  /// [ChatRoomRepository] のインスタンス。
+  final ChatRoomRepository _chatRoomRepository;
+
   /// [ChatMessageRepository] のインスタンス。
-  late final ChatMessageRepository _chatMessageRepository;
+  final ChatMessageRepository _chatMessageRepository;
 
-  /// チャットルームの ID。
+  /// チャットルームの ID.
   final String _chatRoomId;
 
   /// 無限スクロールで取得するメッセージ件数の limit 値。
@@ -95,6 +102,14 @@ class ChatRoomStateNotifier extends StateNotifier<ChatRoomState> {
   late final StreamSubscription<List<ReadChatMessage>>
       _newReadChatMessagesSubscription;
 
+  /// チャットルームを取得する。
+  Future<void> _fetchChatRoom() async {
+    final readChatRoom = await _chatRoomRepository.fetchChatRoom(
+      chatRoomId: _chatRoomId,
+    );
+    state = state.copyWith(readChatRoom: readChatRoom);
+  }
+
   /// 過去のメッセージを、最後に取得した queryDocumentSnapshot 以降の _limit 件だけ取得する。
   Future<void> loadMore() async {
     if (!state.hasMore) {
diff --git a/packages/mottai_flutter_app/lib/chat/chat_room_state.dart b/packages/mottai_flutter_app/lib/chat/chat_room_state.dart
index 5748ca31..7c09b5ad 100644
--- a/packages/mottai_flutter_app/lib/chat/chat_room_state.dart
+++ b/packages/mottai_flutter_app/lib/chat/chat_room_state.dart
@@ -9,6 +9,9 @@ class ChatRoomState with _$ChatRoomState {
     /// チャットページに入ったときの初回ローディング中かどうか。
     @Default(true) bool loading,
 
+    /// チャットルーム。初回ローディングで取得することを期待する。
+    ReadChatRoom? readChatRoom,
+
     /// メッセージを送信中かどうか。
     @Default(false) bool sending,
 
diff --git a/packages/mottai_flutter_app/lib/chat/chat_room_state.freezed.dart b/packages/mottai_flutter_app/lib/chat/chat_room_state.freezed.dart
index 48f190b1..0ea8c021 100644
--- a/packages/mottai_flutter_app/lib/chat/chat_room_state.freezed.dart
+++ b/packages/mottai_flutter_app/lib/chat/chat_room_state.freezed.dart
@@ -19,6 +19,9 @@ mixin _$ChatRoomState {
   /// チャットページに入ったときの初回ローディング中かどうか。
   bool get loading => throw _privateConstructorUsedError;
 
+  /// チャットルーム。初回ローディングで取得することを期待する。
+  ReadChatRoom? get readChatRoom => throw _privateConstructorUsedError;
+
   /// メッセージを送信中かどうか。
   bool get sending => throw _privateConstructorUsedError;
 
@@ -56,6 +59,7 @@ abstract class $ChatRoomStateCopyWith<$Res> {
   @useResult
   $Res call(
       {bool loading,
+      ReadChatRoom? readChatRoom,
       bool sending,
       List<ReadChatMessage> readChatMessages,
       List<ReadChatMessage> newReadChatMessages,
@@ -79,6 +83,7 @@ class _$ChatRoomStateCopyWithImpl<$Res, $Val extends ChatRoomState>
   @override
   $Res call({
     Object? loading = null,
+    Object? readChatRoom = freezed,
     Object? sending = null,
     Object? readChatMessages = null,
     Object? newReadChatMessages = null,
@@ -92,6 +97,10 @@ class _$ChatRoomStateCopyWithImpl<$Res, $Val extends ChatRoomState>
           ? _value.loading
           : loading // ignore: cast_nullable_to_non_nullable
               as bool,
+      readChatRoom: freezed == readChatRoom
+          ? _value.readChatRoom
+          : readChatRoom // ignore: cast_nullable_to_non_nullable
+              as ReadChatRoom?,
       sending: null == sending
           ? _value.sending
           : sending // ignore: cast_nullable_to_non_nullable
@@ -134,6 +143,7 @@ abstract class _$$_ChatRoomStateCopyWith<$Res>
   @useResult
   $Res call(
       {bool loading,
+      ReadChatRoom? readChatRoom,
       bool sending,
       List<ReadChatMessage> readChatMessages,
       List<ReadChatMessage> newReadChatMessages,
@@ -155,6 +165,7 @@ class __$$_ChatRoomStateCopyWithImpl<$Res>
   @override
   $Res call({
     Object? loading = null,
+    Object? readChatRoom = freezed,
     Object? sending = null,
     Object? readChatMessages = null,
     Object? newReadChatMessages = null,
@@ -168,6 +179,10 @@ class __$$_ChatRoomStateCopyWithImpl<$Res>
           ? _value.loading
           : loading // ignore: cast_nullable_to_non_nullable
               as bool,
+      readChatRoom: freezed == readChatRoom
+          ? _value.readChatRoom
+          : readChatRoom // ignore: cast_nullable_to_non_nullable
+              as ReadChatRoom?,
       sending: null == sending
           ? _value.sending
           : sending // ignore: cast_nullable_to_non_nullable
@@ -205,6 +220,7 @@ class __$$_ChatRoomStateCopyWithImpl<$Res>
 class _$_ChatRoomState implements _ChatRoomState {
   const _$_ChatRoomState(
       {this.loading = true,
+      this.readChatRoom,
       this.sending = false,
       final List<ReadChatMessage> readChatMessages = const <ReadChatMessage>[],
       final List<ReadChatMessage> newReadChatMessages =
@@ -223,6 +239,10 @@ class _$_ChatRoomState implements _ChatRoomState {
   @JsonKey()
   final bool loading;
 
+  /// チャットルーム。初回ローディングで取得することを期待する。
+  @override
+  final ReadChatRoom? readChatRoom;
+
   /// メッセージを送信中かどうか。
   @override
   @JsonKey()
@@ -283,7 +303,7 @@ class _$_ChatRoomState implements _ChatRoomState {
 
   @override
   String toString() {
-    return 'ChatRoomState(loading: $loading, sending: $sending, readChatMessages: $readChatMessages, newReadChatMessages: $newReadChatMessages, pastReadChatMessages: $pastReadChatMessages, fetching: $fetching, hasMore: $hasMore, lastReadChatMessageId: $lastReadChatMessageId)';
+    return 'ChatRoomState(loading: $loading, readChatRoom: $readChatRoom, sending: $sending, readChatMessages: $readChatMessages, newReadChatMessages: $newReadChatMessages, pastReadChatMessages: $pastReadChatMessages, fetching: $fetching, hasMore: $hasMore, lastReadChatMessageId: $lastReadChatMessageId)';
   }
 
   @override
@@ -292,6 +312,8 @@ class _$_ChatRoomState implements _ChatRoomState {
         (other.runtimeType == runtimeType &&
             other is _$_ChatRoomState &&
             (identical(other.loading, loading) || other.loading == loading) &&
+            (identical(other.readChatRoom, readChatRoom) ||
+                other.readChatRoom == readChatRoom) &&
             (identical(other.sending, sending) || other.sending == sending) &&
             const DeepCollectionEquality()
                 .equals(other._readChatMessages, _readChatMessages) &&
@@ -310,6 +332,7 @@ class _$_ChatRoomState implements _ChatRoomState {
   int get hashCode => Object.hash(
       runtimeType,
       loading,
+      readChatRoom,
       sending,
       const DeepCollectionEquality().hash(_readChatMessages),
       const DeepCollectionEquality().hash(_newReadChatMessages),
@@ -328,6 +351,7 @@ class _$_ChatRoomState implements _ChatRoomState {
 abstract class _ChatRoomState implements ChatRoomState {
   const factory _ChatRoomState(
       {final bool loading,
+      final ReadChatRoom? readChatRoom,
       final bool sending,
       final List<ReadChatMessage> readChatMessages,
       final List<ReadChatMessage> newReadChatMessages,
@@ -342,6 +366,10 @@ abstract class _ChatRoomState implements ChatRoomState {
   bool get loading;
   @override
 
+  /// チャットルーム。初回ローディングで取得することを期待する。
+  ReadChatRoom? get readChatRoom;
+  @override
+
   /// メッセージを送信中かどうか。
   bool get sending;
   @override
diff --git a/packages/mottai_flutter_app/lib/chat/ui/chat_room.dart b/packages/mottai_flutter_app/lib/chat/ui/chat_room.dart
index 2f1e3f71..70662868 100644
--- a/packages/mottai_flutter_app/lib/chat/ui/chat_room.dart
+++ b/packages/mottai_flutter_app/lib/chat/ui/chat_room.dart
@@ -71,13 +71,9 @@ class _ChatRoomPageState extends ConsumerState<ChatRoomPage> {
 
   @override
   Widget build(BuildContext context) {
-    final readChatRoom =
-        ref.watch(chatRoomFutureProvider(widget.chatRoomId)).value;
-    if (readChatRoom == null) {
-      // TODO: この実装だと、loading 中に UnavailablePage がちらっと見えそうなので改善したい。
-      return const UnavailablePage('チャットルームの情報の取得に失敗しました。');
-    }
     final state = ref.watch(chatRoomStateNotifierProvider(widget.chatRoomId));
+    final loading = state.loading;
+    final readChatRoom = state.readChatRoom;
     return Scaffold(
       appBar: AppBar(
         // TODO: chatPartnerImageUrlProvider を真似して、chatPartnerNameProvider
@@ -88,50 +84,55 @@ class _ChatRoomPageState extends ConsumerState<ChatRoomPage> {
       body: Padding(
         padding: const EdgeInsets.symmetric(horizontal: 8),
         child: AuthDependentBuilder(
-          onAuthenticated: (userId) => state.loading
-              ? const Center(
-                  child: FaIcon(
-                    FontAwesomeIcons.solidComment,
-                    size: 72,
-                    color: Colors.black12,
-                  ),
-                )
-              : Stack(
+          onAuthenticated: (userId) {
+            if (loading) {
+              return const Center(
+                child: FaIcon(
+                  FontAwesomeIcons.solidComment,
+                  size: 72,
+                  color: Colors.black12,
+                ),
+              );
+            }
+            if (readChatRoom == null) {
+              return const UnavailablePage('チャットルームの情報の取得に失敗しました。');
+            }
+            return Stack(
+              children: [
+                Column(
                   children: [
-                    Column(
-                      children: [
-                        Expanded(
-                          child: ListView.builder(
-                            itemCount: state.readChatMessages.length,
-                            reverse: true,
-                            controller: _scrollController,
-                            itemBuilder: (context, index) {
-                              final readChatMessage =
-                                  state.readChatMessages[index];
-                              return _ChatMessageItem(
-                                readChatRoom: readChatRoom,
-                                readChatMessage: readChatMessage,
-                                isMyMessage: readChatMessage.senderId == userId,
-                                chatRoomId: widget.chatRoomId,
-                              );
-                            },
-                          ),
-                        ),
-                        _MessageTextField(
-                          chatRoomId: widget.chatRoomId,
-                          userId: userId,
-                        ),
-                        const Gap(24),
-                      ],
-                    ),
-                    Positioned(
-                      child: Align(
-                        alignment: Alignment.topCenter,
-                        child: _DebugIndicator(chatRoomId: widget.chatRoomId),
+                    Expanded(
+                      child: ListView.builder(
+                        itemCount: state.readChatMessages.length,
+                        reverse: true,
+                        controller: _scrollController,
+                        itemBuilder: (context, index) {
+                          final readChatMessage = state.readChatMessages[index];
+                          return _ChatMessageItem(
+                            readChatRoom: readChatRoom,
+                            readChatMessage: readChatMessage,
+                            isMyMessage: readChatMessage.senderId == userId,
+                            chatRoomId: widget.chatRoomId,
+                          );
+                        },
                       ),
                     ),
+                    _MessageTextField(
+                      chatRoomId: widget.chatRoomId,
+                      userId: userId,
+                    ),
+                    const Gap(24),
                   ],
                 ),
+                Positioned(
+                  child: Align(
+                    alignment: Alignment.topCenter,
+                    child: _DebugIndicator(chatRoomId: widget.chatRoomId),
+                  ),
+                ),
+              ],
+            );
+          },
         ),
       ),
     );