A synchronizer ring for a synchronous meshing type speed change gear has a substantially conical surface and is provided with a wet frictional material which covers a major portion of the conical surface axial length, having a small diameter end spaced from the small diameter end of the conical surface. The frictional material has at least one continuous groove formed on its frictional surface and communicating with opposite ends of the synchronizer ring for conducting a flow of lubricating oil, the groove being formed at a predetermined angle relative to the generatrix of the synchronizer ring. The ring is constructed such that upon frictional engagement with the speed change gear, the small diameter end of the conical surface projects axially outwardly from a corresponding end of a frictional engaging surface of the speed change gear by a predetermined amount, so as to facilitate receipt of oil into the groove.