Abstract: In a seal ring, first and second abutments that are opposed to each other at a cut-apart portion have first and second protrusions 3a and 3b and first and second recesses 4a and 4b that are juxtaposed to each other in the axial direction, and a radial gap 5a is defined between the first protrusion 3a of the first abutment 1a that is pressed against a side wall 13a of an annular groove 13 formed in a shaft member 12 near a non-oil pressure side 14b and the second recess 4b of the second abutment 1b, with the radial gap 5a and a circumferential gap 2 between the first and second abutments 1a and 1b forming a passage through which an oil pressure side 14a of the annular gap 14 communicates with the non-oil pressure side 14b. The abutments 1a and 1b are not complicated in shape, and still, foreign matter contained in oil in the oil pressure side 14a can be smoothly discharged into the non-oil pressure side 14b.

Abstract: The object is to provide a seal ring of which the abutments which oppose each other at the cut-apart portion are not complicated in shape, so that foreign matter contained in oil in the oil pressure side can be smoothly discharged into an annular gap on the non-pressure side. Abutments that are opposed to each other at a cut-apart portion have protrusions 3a and 3b and recesses 4a and 4b that are juxtaposed to each other in the axial direction, and a radial gap 5a is defined between the protrusion 3a of the abutment 1a that is pressed against a side wall 13a of an annular groove 13 formed in a shaft member 12 near a non-oil pressure side 14b and the recess 4b of the other abutment 1b, with the radial gap 5a and a circumferential gap 2 between the abutments 1a and 1b forming a passage through which an oil pressure side 14a of the annular gap 14 communicates with the non-oil pressure side 14b.