LUBRICATING GREASE COMPOSITION

The present invention provides a lubricating grease composition that reduces the start-up friction coefficient on the surface of a contacting part of a resin member particularly in a high-load state, and that also improves wear resistance. This lubricating grease composition for resin members is a lubricating grease composition for resin members that is used by being supplied as a lubricant to a surface of at least a sliding part of a resin member wherein said sliding part slides against another member, the lubricating grease composition comprising: a base oil which is a mixed oil of a poly-a-olefin having a kinematic viscosity of from 18 to 50 mm2/s at 40°C, and an ethylene-a-olefin copolymer having a number-average molecular weight of from 40,000 to 200,000; a lithium-based composite soap as a thickener; and, as a solid lubricant, a polytetrafluoroethylene resin at a blending ratio of from 4 to 12 mass% with respect to the entire lubricating grease composition. The base oil has a kinematic viscosity of from 80 to 200 mm2/s at 40°C, and the lubricating grease composition has a worked penetration within the range of from 265 to 340.