An object of the present invention is to provide an antipruritic agent having a novel action mechanism.The present invention provides an antipruritic agent comprising a compound represented by the following general formula (1): wherein R1 represents a hydrogen atom or alkyl; the ring Q represents a cyclohexylene group or a phenylene group; A1 and A2 represent a single bond or an alkylene group; E represents —NHCO—; A3 represents a single bond or a divalent saturated or unsaturated aliphatic hydrocarbon group; R3 represents a non-cyclic aliphatic hydrocarbon group; and R4 and R5 are the same or different and each represents a hydrogen atom or alkyl, or a pharmaceutically acceptable salt thereof as an active ingredient.