Thrust washer

A thrust washer made of a material containing a resin and provided with a ring-shaped portion that surrounds an insertion hole, wherein

• a front surface and a back surface of the ring-shaped portion are formed as sliding surfaces respectively, each of the sliding surfaces being slidable with another member, and the thrust washer is provided with at least one oil groove on at least one of the front surface and the back surface, the at least one oil groove being recessing from the sliding surface where the at least one oil groove is provided and being configured to allow lubricating oil to flow in;
• a hole penetrating through the ring-shaped portion is not formed and a space between the front surface and the back surface of the ring-shaped portion is blocked by the ring-shaped portion,
• the at least one oil groove is provided with an opening portion in an inner peripheral end side of the ring-shaped portion, the opening portion being recessed from the sliding surface and configured to allow the lubricating oil to flow in from the insertion hole side;
• an outer periphery end side of the ring-shaped portion of an oil groove of the at least one oil groove is provided with an oil stop wall which is configured to separate the oil groove and an outside of the ring-shaped portion and suppress flow of the lubricating oil flowed into the oil groove toward an outer periphery side of the ring-shaped portion, the position of the oil stop wall in a thickness direction of the thrust washer is the same as that of sliding surface, and
• a sliding area ratio of each of the sliding surfaces to a projection plane in plan view of the ring-shaped portion is provided within a range of from 60% to 85%.