A CB2 receptor modulator comprising an imidazole derivative represented by the general formula (I):[wherein, R1 represents optionally substituted lower alkyl or the like； R2 represents optionally substituted cycloalkyl or the like； R3 represents optionally substituted aryl or the like； and n represents an integer of 0 to 3] or a pharmaceutically acceptable salt thereof as an active ingredient, and the like are provided.
