A tablet inspection device (11) includes a lighting unit (13) configured to emit parallel light to a medicine package (21) enclosing therein a semi-transparent tablet that is capable of transmitting light, a camera unit (12) configured to capture an image of the medicine package (21) irradiated with the parallel light, so as to obtain a transmission image of the medicine package (21), and an image processing unit (15) configured to detect, as an area of the semi-transparent tablet, an area having a center part and a periphery part which has brightness lower than brightness of the center part, in the transmission image.
