Seal ring

A seal ring that is attached to an annular groove provided on an outer periphery of a shaft and seals an annular gap between the shaft and a housing that rotate relative to each other, to maintain fluid pressure in a sealed region in which the fluid pressure is configured to change,

• the seal ring sliding on a lateral wall surface of the annular groove on a lower pressure side,
• the seal ring comprising:
• an abutment joint part provided at one portion in a circumferential direction thereof;
• a plurality of dynamic pressure generation grooves provided at intervals in the circumferential direction on a side of a sliding surface thereof sliding on the lateral wall surface;
• and
• foreign matter discharging holes that are provided between a region in which the plurality of dynamic pressure generation grooves is arranged and the abutment joint part in the circumferential direction on the side of the sliding surface sliding on the lateral wall surface, and that are capable of catching foreign matter intruding from the abutment joint part and discharging the caught foreign matter to a side of an inner peripheral surface of the seal ring.