An image pickup apparatus includes an optical system, an image sensor configured to photoelectrically convert an optical image formed by the optical system and to output image data, an infrared cut filter movable between a first position at which the infrared cut filter is inserted into an optical path of the optical system and a second position at which the infrared cut filter is removed from the optical path of the optical system, and a control unit configured to determine, based on the image data, whether or not the infrared cut filter is located at a position different from each of the first position and the second position.