An inspection apparatus for inspecting the appearance of an inspection target object is provided. The inspection apparatus according to one embodiment of the present disclosure includes a support part configured to hold an inspection target object such that a side surface of the inspection target object faces a predetermined direction, a light source configured to irradiate light toward the inspection target object, a diffusion reflector configured to diffusely reflect at least a part of the irradiated light to irradiate the reflected light to the side surface of the inspection target object, and at least one inspection part configured to inspect the inspection target object by receiving the light reflected from the inspection target object and the diffusion reflector.