To manufacture a urine-absorbing diaper at low cost which eliminates causes of bedsore by surely absorbing urine passed and which can be easily and speedily replaced.

A water-absorbing diaper main body 3 with a through-hole 2 formed is provided. The diaper main body 3 consists of a pair of divided cloths 3a, 3b fixed at opposing edge parts 4, 5, and the through-hole 2 is formed by opening a part of the opposing edge parts 4, 5, through which a penis Ma of a man-user M is inserted, and the diaper main body 3 is folded around a lower belly of the user M so as to wrap the penis Ma.