An optical apparatus may include a holding member movable in an optical axis direction, a screw member extending in the optical axis direction and rotatable, a transmission member configured to engage with the screw member and transmit power in the optical axis direction according to rotation of the screw member, a coupling member configured to be coupled to the holding member and rotatably support the transmission member, a contact member configured to contact the transmission member, a first biasing unit configured to bias the contact member toward the transmission member in the optical axis direction, and a second biasing unit configured to bias the transmission member toward the screw member. In the optical axis direction, the transmission member may be biased toward the coupling member by the contact member. In the optical axis direction, the coupling member may be biased toward the holding member by the transmission member.