diff --git a/CHANGES.md b/CHANGES.md
index b7d04f2..ed676de 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,7 +11,9 @@
 
 ## develop
 
-- [ADD] ハードウェアエンコーダを利用するかどうかを設定する `UseHardwareEncoder` オプションを追加
+- [ADD] デバイスを掴まないようにする `NoVideoDevice`, `NoAudioDevice` を追加
+  - @melpon
+- [ADD] ハードウェアエンコーダを利用するかどうかを設定する `UseHardwareEncoder` を追加
   - @melpon
 - [UPDATE] SoraClientContext を利用してコードを短くする
   - @melpon
diff --git a/Sora/Sora.cs b/Sora/Sora.cs
index e90ab1f..669197e 100644
--- a/Sora/Sora.cs
+++ b/Sora/Sora.cs
@@ -100,6 +100,8 @@ public class Config
         public SpotlightFocusRidType? SpotlightUnfocusRid;
         public bool? Simulcast;
         public SimulcastRidType? SimulcastRid = null;
+        public bool NoVideoDevice = false;
+        public bool NoAudioDevice = false;
         public CapturerType CapturerType = Sora.CapturerType.DeviceCamera;
         public UnityEngine.Camera UnityCamera = null;
         public int UnityCameraRenderTargetDepthBuffer = 16;
@@ -282,6 +284,8 @@ public void Connect(Config config)
         cc.simulcast = config.Simulcast.GetValueOrDefault();
         cc.simulcast_rid = config.SimulcastRid == null ? "" : config.SimulcastRid.Value.ToString().ToLower();
         cc.insecure = config.Insecure;
+        cc.no_video_device = config.NoVideoDevice;
+        cc.no_audio_device = config.NoAudioDevice;
         cc.capturer_type = (int)config.CapturerType;
         cc.unity_camera_texture = unityCameraTexture.ToInt64();
         cc.video = config.Video;
diff --git a/proto/sora_conf_internal.proto b/proto/sora_conf_internal.proto
index 59c69d4..4cc1120 100644
--- a/proto/sora_conf_internal.proto
+++ b/proto/sora_conf_internal.proto
@@ -54,6 +54,8 @@ message ConnectConfig {
     bool enable_simulcast = 14;
     bool simulcast = 15;
     string simulcast_rid = 16;
+    bool no_video_device = 160;
+    bool no_audio_device = 161;
     int32 capturer_type = 17;
     int64 unity_camera_texture = 18;
     string video_capturer_device = 19;
diff --git a/src/sora.cpp b/src/sora.cpp
index 207f797..1621341 100644
--- a/src/sora.cpp
+++ b/src/sora.cpp
@@ -209,10 +209,10 @@ void Sora::DoConnect(const sora_conf::internal::ConnectConfig& cc,
 #endif
 
         unity_adm_ = CreateADM(
-            media_dependencies.task_queue_factory, false, cc.unity_audio_input,
-            cc.unity_audio_output, on_handle_audio_, cc.audio_recording_device,
-            cc.audio_playout_device, dependencies.worker_thread, worker_env,
-            worker_context);
+            media_dependencies.task_queue_factory, cc.no_audio_device,
+            cc.unity_audio_input, cc.unity_audio_output, on_handle_audio_,
+            cc.audio_recording_device, cc.audio_playout_device,
+            dependencies.worker_thread, worker_env, worker_context);
         media_dependencies.adm = unity_adm_;
 
 #if defined(SORA_UNITY_SDK_ANDROID)
@@ -279,11 +279,11 @@ void Sora::DoConnect(const sora_conf::internal::ConnectConfig& cc,
     }
 
     auto capturer = CreateVideoCapturer(
-        cc.capturer_type, (void*)cc.unity_camera_texture,
+        cc.capturer_type, (void*)cc.unity_camera_texture, cc.no_video_device,
         cc.video_capturer_device, cc.video_width, cc.video_height, cc.video_fps,
         on_frame, sora_context_->signaling_thread(), env, android_context,
         unity_context_);
-    if (!capturer) {
+    if (!cc.no_video_device && !capturer) {
       on_disconnect((int)sora_conf::ErrorCode::INTERNAL_ERROR,
                     "Capturer Init Failed");
       return;
@@ -297,9 +297,12 @@ void Sora::DoConnect(const sora_conf::internal::ConnectConfig& cc,
         audio_track_id, sora_context_->peer_connection_factory()
                             ->CreateAudioSource(cricket::AudioOptions())
                             .get());
-    std::string video_track_id = rtc::CreateRandomString(16);
-    video_track_ = sora_context_->peer_connection_factory()->CreateVideoTrack(
-        video_track_id, capturer.get());
+
+    if (capturer) {
+      std::string video_track_id = rtc::CreateRandomString(16);
+      video_track_ = sora_context_->peer_connection_factory()->CreateVideoTrack(
+          video_track_id, capturer.get());
+    }
   }
 
   {
@@ -627,6 +630,7 @@ bool Sora::InitADM(rtc::scoped_refptr<webrtc::AudioDeviceModule> adm,
 rtc::scoped_refptr<webrtc::VideoTrackSourceInterface> Sora::CreateVideoCapturer(
     int capturer_type,
     void* unity_camera_texture,
+    bool no_video_device,
     std::string video_capturer_device,
     int video_width,
     int video_height,
@@ -637,6 +641,10 @@ rtc::scoped_refptr<webrtc::VideoTrackSourceInterface> Sora::CreateVideoCapturer(
     void* android_context,
     UnityContext* unity_context) {
   if (capturer_type == 0) {
+    if (no_video_device) {
+      return nullptr;
+    }
+
     // 実カメラ（デバイス）を使う
     sora::CameraDeviceCapturerConfig config;
     config.width = video_width;
diff --git a/src/sora.h b/src/sora.h
index 8935e3b..c570ea6 100644
--- a/src/sora.h
+++ b/src/sora.h
@@ -112,6 +112,7 @@ class Sora : public std::enable_shared_from_this<Sora>,
   CreateVideoCapturer(
       int capturer_type,
       void* unity_camera_texture,
+      bool no_video_device,
       std::string video_capturer_device,
       int video_width,
       int video_height,