PURPOSE: To prevent proliferation of miscellaneous bacteria and mold, by mak ing at least one member among composition materials of the seat, the seat cover, and a body case of a warm-water washing seat formed by a high- crystallizable polypropylene resin or a resin body composed of a high- crystallizable polypropylene resin and an elastic body.

CONSTITUTION: This warm-water washing seat is provided with a seat 1, a washing nozzle 2 for discharging warm-water to wash the parts and a body case 3 of the warm-water washing seat. All of these are formed by a resin body composed of a high-crystalline polypropylene resin and an elastic component in which an antimicrobial agent is included. The high-crystalline polypropylene resin is made to have a stereoregularity degree of 98% or more and the elastic component is made of at least one kind between polyethylene resin and ethylene-propylene rubber. Thereby, the warm-water washing seat has an improved chemical-proof activity, and solvent cracks and a problem of deteriorated bending strength are not generated even when a strong cleaning agent is used.