To provide a blade driving mechanism for camera which is equipped with an actuator and is advantageous in terms of miniaturization and reduction of the cost.

The main body part 3 of an electromagnet is attached to a bottom board 1 having an aperture part 1a for a photographing optical path, and a coil 4 is wound round one end of the main body part 3 and a driving member 5 is rotatably attached to the shaft 3b at the other end of the main body part 3. A sector 8 arranged between the board 1 and the member 5 is rotatably attached to the board 1, and the pin 8b of the sector 8 is fit in the slot 5b of the member 5. Then, a spring 7 energizes the member 5 to rotate clockwise. When a current is applied to the coil 4, the member 5 is rotated counterclockwise by attractive force acting between an iron piece member 6 embedded in the edge and the member 5, so that the sector 8 is actuated to be closed. When the application of the current is stopped thereafter, the member 5 is rotated clockwise by the energizing force of the spring 7, so that the sector 8 is actuated to be opened.