Provided is a seal ring with which it is possible to stably reduce rotational torque while suppressing leakage of a fluid to be sealed. This seal ring is characterized by being provided with: an abutment part (110) provided to one location in the circumferential direction; a plurality of dynamic-pressure-generating grooves (120) provided, at intervals along the circumferential direction, to a sliding-surface side that slides relative to a side wall surface of an annular groove; and impurity excretion grooves (130) that are provided to the sliding-surface side that slides relative to the side wall surface, the impurity excretion grooves (130) being provided between the abutment part (110) and the regions where the plurality of dynamic-pressure-generating grooves (120) are arranged in the circumferential direction, and being capable of trapping impurities that have gotten in through the abutment part (110), and excreting the trapped impurities out of the sliding part between the seal ring and the side wall surface.