An optical apparatus includes an image pickup optical system, an evacuating optical system movable between a shooting state and an evacuating state, a first urging member, a first moving member, a second moving member including a sliding portion and a first, second, and third cam follower portions, and a first cam cylinder member including a plurality of first cam portions. The first, second, and third cam follower portions follows the plurality of first cam portions. A second urging member urging in a redial direction of the second moving member is attached to the first cam follower portion. In a case where the evacuating optical system is the evacuating state, a straight line extended in a direction, where the evacuating optical system works on the sliding portion by the first urging member, intersects with a line segment between the second and third cam follower portions.