PURPOSE: To make the constitution of a shutter mechanism part concise and to reduce the cost of the camera, while maintaining a photographing function and accuracy required for practical use by constituting a member for reciprocating-driving a sector, of a shape memory alloy member, and reciprocating-driving directly the sector by utilizing the shape variation caused by a shape difference at the time of non-electric conduction and at the time of electric conduction.

CONSTITUTION: A sector driving member 21 is formed by a shape memory alloy member having such a quality as the shape is varied by an electric conduction heating action. Subsequently, by utilizing the shape variation (dimension variation) generated by a difference of shapes at the time of non-electric conduction and at the time of electric conduction, a shielding state and an opening state of a sector 11 are realized. In such a way, while maintaining a photographing function and accuracy required for practical use, the constitution of a shutter mechanism part can be made concise, and a low cost required for this kind of film integral type camera can be realized.