To provide a surface-treating agent for an oil seal lip part, capable of effectively elongating a life of an oil seal and effectively saving energy of an oil seal using apparatus when the oil seal is used for a sliding portion and a motion portion by coating a sliding surface of a seal lip part therewith in respect to the surface-treating agent applied to a vulcanized rubber surface that forms a lip part of the oil seal comprising the lip part and a metal ring.

A surface-treating agent for an oil seal lip part, which is applied for a vulcanized rubber surface that forms a lip part of an oil seal comprising the lip part and a metal ring, contains an adduct compound comprising an adduct body of toluene diisocyanate and trimethylol propane and a lubricating filler.