To inexpensively suppress uneven exposure caused by an opening and closing operation of a shutter blade.

An exposure aperture 31 is provided in front of a light shielding cylinder 30, and an ND filter 33 to adjust an incident light quantity to a photographic film is disposed inside the light shielding cylinder 30. A shutter blade 38 is pivotally attached as rotatable and energized by a spring 40 to a position to close the exposure aperture 31. When a shutter driving lever kicks the shutter blade 38, the shutter blade 38 moves against the energizing force of the spring 40 to a position to open and expose the exposure aperture 31. On this occasion, the shutter blade 38 starts to open the exposure aperture 31 from a right upper portion and ends at a left lower portion. The ND filter 33 is given such density gradation that the optical density gradually decreases from the right upper corner to the left lower corner along the moving direction of the shutter blade. Thereby, difference in the exposure light quantity in four corners of a photographic film frame can be significantly decreased.