Crystals of a dispiropyrrolidine compound or a salt thereof which inhibits the action of Mdm2 are provided. The present invention provides crystals of (3R,4S,5R)-N-[(3R,6S)-6-carbamoyltetrahydro-2H-pyran-3-yl]-6"-chloro-4-(2-chloro-3-fluoropyridin-4-yl)-4,4-dimethyl-2"-oxo-1",2"-dihydrodispiro[cyclohexane-1,2-pyrrolidine-3,3"-indole]-5-carboxamide or a salt thereof which inhibits Mdm2 and has anti-tumor activity. The present invention also provides a medicament comprising the same.
