A tablet cassette provided herein is conveniently available for irregularly shaped or halved tablets as with regularly shaped tablets. The tablet cassette (270) includes a fall prevention mechanism (280) configured to prevent extra tablets from falling down into an outlet port (228). The fall prevention mechanism (280) has a round belt (281) disposed upwardly of the outlet port (228) and at a position higher than partition portions (225). The fall prevention mechanism (280) is configured to prevent extra tablets from falling such that the extra tablets locating on or above or protruding from one of the tablet receiving portions (226), which comes closest to the outlet port (228) by rotation of the rotor (290), are pushed toward the rotor (290) by means of a repulsive force generated by deformation of the round belt (281) as caused when the extra tablets abut on the round belt (281).
