rotates clockwise and the lever 17 thereby starts moving downward as viewed in fig2 b at that time the levers 19 and 13 and the flash unit 2 are held stably in the stored state until the shaft 19b of the lever 19 contacts the edge 17d of the fan shaped hole 17b of the lever 17 after the shaft 19b contacts the edge 17d of the fan shaped hole 17b the lever 19 rotates counterclockwise against the bias force of the spring 18 and the lever 13 and the flash unit 2 thereby starts a clockwise rotation as the lever 19 rotates counterclockwise the center line of the spring 18 comes closer to the center of the rotation of the lever 19 and the bias force of the spring 18 which urges the flash unit 2 counterclockwise is thus weakened after the bias force of the spring 18 is reduced to zero the spring urges the lever 19 counterclockwise the motor m stops when a detection means not shown detects that the roller 16g has risen on the top portion of the cam 15 thereby providing the flash unit in a popped up state shown in fig2 b the position of the levers 16 and 17 is determined by the action of the cam 15 and the position of the flash unit 2 and that of the levers 13 and 19 are determined by the biasing force of the spring 18 and the contacting position of the one end portion 3b of the fan shaped hole 3a of the housing 3.