To provide a self-timer having a reflection mirror which has both function of a mirror to reflect a photographing range and the self-timer to release a shutter after specified time in a simple camera in which they are not installed.

This self-timer having the reflection mirror is equipped with an attaching means 2 provided at a self-timer main body 1 having the reflection mirror and to fix the self-timer having the reflection mirror to a specified camera, a timer means 3 provided at the inside of the self-timer main body 1 having the reflection mirror and to release the shutter of a camera by leaving time after specified operation, a manual shutter means 4 to manually release the shutter of the camera and a reflection mirror means 5 provided with a mirror M provided at the self-timer main body 1 having the reflection mirror so as to be on a front side similar to the lens installation side of the camera and having a reflection surface to reflect a photographing feasible range by the camera.