A registration data acquisition unit 22 acquires registration data from an image captured by a detection camera 30. The registration data is feature data that represents the features distributed over a first region of the surface of a tablet 90, the first region having a prescribed size. A collation data acquisition unit 25 acquires collation data from an image captured by an inspection camera 40. The collation data is feature data that represents the features distributed over a second region of the tablet 90, the second region having a prescribed size. A verification unit 26 compares registration data that is stored in a registration data storage unit 23 and collation data that has been acquired by the collation data acquisition unit 25 for the same tablet and verifies whether the reliability of the registration data is at or above a predetermined criterion value.
