To execute automatic exposure control by a simple structure.

A shutter plate 34 and a filter plate 31 are provided on the front of a shutter aperture 29. The filter plate 31 by which exposure is adjusted by partially absorbing incident light from a photographing lens 13 is freely movably provided on a photographing optical path. The density of the filter plate 31 is changed in a moving direction. The filter plate 31 is driven through a driving gear 41 by an analog meter 39. A shaft 39a is turned in accordance with a luminance signal from a solar battery 16 by the analog meter 39. Thus, the moving amount of the filter plate 31 is determined in accordance with object luminance.