A radiography apparatus includes: an irradiation unit that emits radiation; an arm that holds the irradiation unit and an image receiving unit in a facing posture such that the image receiving unit is attachable and detachable; a connection portion or a main body portion that rotatably supports the arm; a first locking mechanism and a second locking mechanism that lock a rotation of the arm with respect to the connection portion or the main body portion; a photo sensor that detects whether or not the image receiving unit is detached from the arm; and a control unit that performs control not to release the lock even in a case in which an unlock operation for releasing the lock of the rotation by the first locking mechanism and the second locking mechanism is performed in a state in which the image receiving unit is detached from the arm.