Patent ID: 7413223

Claim:
An inspection device comprising: a light source used for irradiating light; a reflection-type prism that irradiates the light from the light source to a hologram provided on an inspection target that is placed downward, and diffracts light rays in different directions that are reflected from the hologram upward in the same or substantially the same direction; and a case that houses the light source and the reflection-type prism, wherein the light source is placed so as to irradiate the light from the light source from one end toward the other end of the reflection-type prism in the horizontal direction, an extension portion is provided so as to extend from the other end of the reflection-type prism in the horizontal direction, a light reflection unit is provided on the lower face of the extension portion, and a light transmission portion is provided at a portion of the case that corresponds to the upper face of the extension portion.