Stacking inspection apparatus for electrode plate or unit cell

A stacking inspection apparatus includes: camera units that generate an aligned image by photographing four corner points of the outer periphery of the electrode plates or the unit cells at an upper part in a stacking direction of the electrode plates or the unit cells; and light irradiation units that irradiate light signals to four corner of the inspection object, and sensors that recognize the light signal irradiated from the light irradiation units and determine whether or not alignment of the first electrode plate and the second electrode plate is defective.