diff --git a/tier4_hmi_msgs/CMakeLists.txt b/tier4_hmi_msgs/CMakeLists.txt
index 61e52856..037b5e97 100644
--- a/tier4_hmi_msgs/CMakeLists.txt
+++ b/tier4_hmi_msgs/CMakeLists.txt
@@ -16,6 +16,7 @@ ament_auto_find_build_dependencies()
 
 rosidl_generate_interfaces(${PROJECT_NAME}
   srv/Announce.srv
+  srv/SetVolume.srv
   DEPENDENCIES
     builtin_interfaces
     tier4_external_api_msgs
diff --git a/tier4_hmi_msgs/srv/SetVolume.srv b/tier4_hmi_msgs/srv/SetVolume.srv
new file mode 100644
index 00000000..3d674e0f
--- /dev/null
+++ b/tier4_hmi_msgs/srv/SetVolume.srv
@@ -0,0 +1,3 @@
+float32 volume
+---
+tier4_external_api_msgs/ResponseStatus status