To correctly and stably retain an affected part by reducing occurrence of a pain or a skin manifestation during a mount.

A truss comprises in combination a front member 11 brought into contact with a patient P's lower abdomen, a rear member 12 brought into contact with a patient P's back side symmetrical to the member 11, left and right pelvic bands 21, 21 attached to the member 11, left and right thigh bands 22, 22 attached to the member 12, and a retaining pad 31 attached to an inner surface side of the member 11. The members 11, 12 are fixed by utilizing the pelvic bands 21, 21, the thigh bands 22, 22 are coupled to the member 11 from below, and the pad 31 is positioned at the affected part and can be brought into contact with the affected part.