To provide piston packing suitable as an oil ring capable of securing a required sealing property in particular by lowering sliding frictional resistance with a cylinder at the time of starting piston action.

This device is constituted of a load ring 11 made of black rubber on the inner peripheral side to secure a required sealing property by preventing leakage of fluid in a cylinder and a seal ring 12 on the outer peripheral side, a main body ring 13 of the seal ring 12 on the outer peripheral side is molded of urethane rubber, and a composite material sealing layer part 14 of a material of a low frictional characteristic, for example, of ceramic titanium, molybdenum disulfide or polytetrafluoroethylene and urethane rubber by a centrifugal molding method. A seal lip part 15 to slide and to make contact with an inner surface of the cylinder 20 with airtightness and liquidtightness is formed in an irregular shape on an outer peripheral part of this composite material sealing layer part 14.