To reduce height dimension while securing the ability of an electromagnetic actuator.

This shutter 1 is provided with a substrate 2 having an aperture for photographing 2a, light shielding blade members 3A and 3B opening and closing the aperture 2a and the electromagnetic actuators 4A and 4B driving the blade members 3A and 3B. The actuators 4A and 4B are provided with movable members 6 which are provided with a permanent magnet 13, whose one end parts are coupled to the blade members 3A and 3B through actuating pins 11 and whose other end parts are journaled so that they can be rocked, a yoke member 15 having an upper and a lower yokes 17 and 16 fitted to the substrate 2 and arranged so as to interpose the magnet 13 in an upper and a lower directions and coils 18a and 19a arranged at the yoke member 15 so as to be opposed to the magnets 13 and wound round in almost parallel with the substrate 2. Besides, they are provided with regulation parts P regulating the rocking areas of the pins 11 arranged at one end parts of the movable members 6.