An optical apparatus is disclosed which can control a position of a driven member with precision using a simple control algorithm. The optical apparatus includes an actuator, a driven member, a transmission mechanism for transmitting a driving force from the actuator to the driven member, a first detector for detecting driving of the actuator and for outputting a signal corresponding to a detection result, a second detector for detecting driving of the driven member and for outputting a signal corresponding to a detection result, and a controller for controlling the actuator, wherein the controller determines, after activating the actuator, one of the first and second detectors which the one outputs a signal corresponding to a predetermined driving amount earlier, and controls the actuator based on the signal from the one that has been determined.