To provide a valve stem seal which is simple in constitution, while the dimensional control at the time of manufacture is easy, and assembly is also easy.

This is for sealing between a valve stem 15 pushed through to a valve guide 13 and a sleeve-like valve guide 13, it is installed at one edge of valve guide 13, and in the valve stem seal it has a sealing material 10 slides to the periphery side of valve stem 15, to the valve guide side of a sealing material 10, the mating part wall surface 13a and have been formed on the edge side of the valve-guide 13, provides a washer 12 which is to be fixed in fitting part.