To provide a resin seal ring having a stable low oil leak property ranging from a low temperature area to a high temperature area and suitable usable for the lockup clutch part of a torque converter.

This resin seal ring of rectangular shape in cross section is used for the lockup clutch of the torque converter and comprises abutments opposed to each other. One abutment comprises an abutted face formed on the inner diameter surface side of the resin seal ring and a lip projected from the abutted face and a pocket recessed therefrom on the outer diameter surface side. The other abutment comprises an abutted face, a pocket, and a lip formed to be complementarily fitted to the abutted face, the pocket, and the lip.