Abstract: A wash-basin includes a wash bowl portion and an outer lateral portion that is connected to an outer peripheral portion of the wash bowl portion and has a lower end portion mounted on the supporting member. A step portion having a shape, in which a mounting portion side is recessed toward an outer lateral surface side of the wash bowl portion from an outer peripheral surface, is formed at a connection portion between the outer peripheral surface of the outer lateral portion and a peripheral edge of the mounting portion, which is mounted on the supporting member, of outer lateral portion. The step portion has a size that allows caulking work between the supporting member and the step portion.

Abstract: A wash basin includes a wash bowl portion and an outer lateral portion that is connected to an outer peripheral portion of the wash bowl portion and has a lower end portion mounted on the supporting member. On a lower surface side of the wash bowl portion, each of recessed grooves is formed in a connecting portion between an outer peripheral surface of the outer lateral portion and the wash bowl portion.