To achieve a novel design for use as a washing tool, to improve productivity and to achieve a preferable foaming property of soap, detergent and the like.

A three-dimensional object 4 is inflated by laminating a plurality of sheets 1 comprising a synthetic resin foaming body, forming a fusion part 3 by performing a heat pressing fusing at the center part of each sheet 1, making the fusing area of the fusion part 3 to be 0.1 to 10% of the surface area of the sheet 1, and making the thickness of the fusion part 3 to be ≤50% of the whole thickness of the laminated sheet 1. At this time, a sheet 1 from which a cell membrane is removed can be used as well.