To provide an optical mechanism capable of suppressing power consumption by efficiently controlling a driving motor to perform charge operation which requires high-speed operation.

The optical mechanism includes: a charge means 8 that charges biasing mechanisms 8a and 25 of a movable mirror 20 and a mechanical shutter 30; a motor 3 that generates driving force from rotation in a first direction in a first period from start of charge by the charge means until start of recharge after releasing the charge; a transmission mechanism that has a turning member 5 transmitting driving force to the charge means and transmission parts 3a and 4 transmitting the driving force to the turning member; and a motor control part 15 that sets target angular velocity in accordance with an angle of the turning member in a second period included in the first period and including a charge release point of time, and feedback-controls the motor so that the angular velocity of the turning member may come close to the target angular velocity.