A body of a seal ring is in an annular shape and includes an abutment joint at a location in the circumferential direction. The opposite ends of the body forming the abutment joint include an overlapping part where one end and the other end of the body overlap each other. The overlapping part includes a step cut joint that forms an overlap in the radial direction and a lap joint that forms an overlap in the plate thickness direction. Facing faces that face each other in the plate thickness direction in the lap joint are planes extending from an inner peripheral circular arc of the seal ring up to an outer peripheral circular arc of the seal ring.