An undergarment is provided that favorably adheres to the skin and has superior shape retention. The undergarment according to the present invention is an undergarment that is comprised of a fabric having a woven structure, a knitted structure or a non-woven fabric structure, wherein the fabric contains a filament yarn A having a filament diameter of 10 to 1000 nm and a filament yarn B having a filament diameter greater than 1000 nm, and the filament yarn A is exposed on the side that contacts the skin.