Abstract: [Problem] To catch excreta whether a person is sitting or supine and essentially independent of movements of the person's body. [Solution] The diaper unit is configured from: an outer diaper wrapper (2), which encloses an artificial gluteal block constructed from an elastic member and which is provided with a cover (20) on which hook end loop fasteners (26aa) are provided at least on the portion that faces a person's gluteal region when worn; and an inner diaper wrapper (3) provided with a main diaper body (30), which has an opening (36) at the section of the diaper for handling feces and which adheres to the outer diaper wrapper (2) by means of the hook and loop fasteners (26aa) of the outer diaper wrapper (2), and a fecal bag (40) the interior of which is water-absorbing and the exterior of which is waterproof, which is bonded to the opening (36) of the diaper body (30) and is accommodated in a hole in the outer diaper wrapper.