To provide a sanitary coelom sealing device preventing the leakage of rectal waste from the anus due to the relaxation of the sphincter caused by death or dementia so as to simplify the operation done by a person in charge of preventing the leakage or a caregiver, while preventing the person and people around from being infected due to the leakage of internal substances.

The coelom sealing device comprising a molding 2 of highly water-absorbing fibers, a water-soluble sheet 3 covering the outer periphery of the molding 2, and a lubricant 4 covering the water-soluble sheet 3 is inserted into the anus to prevent the leakage of rectal waste.