The present invention provides a diaper for a male pet which is not displaced even when the diaper is fitted on a male pet for a long time and can cover a urethral opening of the male pet and can surely capture urine or the like. A diaper for a male pet which is put on a male pet and includes a diaper body (101) having a back pad portion (A) which is brought into contact with the vicinity of a back of the male pet, a crotch pad portion (B) which is brought into contact with the vicinity of a crotch of the male pet, and a belly pad portion (C) which is brought into contact with the vicinity of a belly of the male pet, wherein the diaper for a male pet further includes a urine capture member (104) which has a urine capture region (D) which is arranged at a position and is set to a size to allow to cover a urethral opening of the male pet and the vicinity of the urethral opening when the diaper for a male pet is put on the male pet and includes a urine absorbing body (104) which absorbs urine, and a holding structure (111) which holds the diaper such that the urine capture region is brought into contact with the belly of the male pet even after the urine absorbing body absorbs urine.
