To provide a thin-shaped/small-sized camera shutter where the opening/closing of the shutter aperture is stabilized.

A support shaft 12a for a rotor 4 is positioned eccentric from the centroid position of the rotor 4. In the case of opening the shutter, the rotor 4 is rotated counterclockwise, and the pole (magnetic pole part) of the rotor 4 is stopped adjacently close to an arm part 6b, and the open state of the shutter is maintained by a magnetic force working between the rotor 4 as a magnet and the arm part 6b as a soft magnetic body. On the other hand, in the case of closing the shutter, the rotor 4 is rotated by 60°clockwise, and the pole of the rotor 4 is stopped adjacently close to the arm part 6a, and the closed state of the shutter is maintained by the magnetic force working between the rotor 4 as the magnet and the arm part 6a as a soft magnetic body. By bringing the rotor 4 close to the arm part 6a/6b in the state where the shutter is open/closed, the open/closed state of the shutter is stabilized.