In an electromagnetic trigger device in a camera capable of effecting time photography, and having a trigger switch, a power source and a motor for driving a shutter driving mechanism, there is provided a restraining lever movable between a restraining position and a non-restraining position. The lever, when in the restraining position, restrains the shutter driving mechanism in fully closed shutter position. A motor switch is adapted to be closed to energize the motor when the restraining lever is in the non-restraining position. A phase switch is parallel-connected to the motor switch and operatively associated with the shutter driving mechanism to be opened in the fully open and the fully closed position of the shutter. An actuating coil is responsive to closing of the trigger switch to be connected to the power source for a predetermined time and thereby energized to attract the restraining lever to the non-restraining position. A selector member is provided for selecting continuous photography and time photography. A holding coil is responsive, during continuous photography, to closing of the trigger switch to be connected to the power source and thereby energized to hold the restraining lever in the non-restraining position. A current generating circuit is provided which includes a timing switch adapted to be opened for a predetermined time from fully opening till fully closing of the shutter. When the trigger switch is opened during continuous photography, the current generating circuit flows a current through the timing switch to maintain the holding coil energized to hold the lever in the non-restraining position.