A strobe device in which a damper device is built has a light-emitting portion main unit containing a flash-emitting tube and other members therein supported by a rotational supporting mechanism having rotational damper functions. The rotational supporting mechanism includes a rotational shaft fixed to the light-emitting portion main unit and a bearing tube fixed to the camera main unit to which the rotational shaft is fit with a slight gap therebetween. Grease is filled and sealed in the gap between the rotational shaft and the bearing, thus configuring the rotational supporting mechanism. When the light-emitting portion main unit rotates toward a pop-up position due to the pressing force of a spring, friction torque of the rotational supporting mechanism acts to suppress the moving speed, and bouncing at the pop-up position is prevented.