A one-way clutch (1, 201) comprising: an inner ring (5, 205); an outer ring (3, 203) arranged coaxially with said inner ring; a plurality of first torque transmission members (19, 219) provided between said inner ring and said outer ring at predetermined circumferential intervals and configured to transmit a first torque between said inner ring and said outer ring; a plurality of spring members (41, 241) that bias said plurality of first torque transmission members to their respective torque transmission positions; a plurality of retaining portions (37, 237) arranged between the adjacent first torque transmission members (19, 219) in one-to-one correspondence with the first torque transmission members (19, 219) and configured to shift said corresponding first torque transmission members (19, 219) from said torque transmission positions to torque transmission incapable positions by moving in one circumferential direction toward said corresponding first torque transmission members (19, 219), to retain said first torque transmission members (19, 219) at said torque transmission incapable positions; characterized in that a second torque transmission member (23, 223) provided between each of said retaining portions (37, 237) and said first torque transmission members (19, 219) corresponding thereto in a circumferential direction, and provided between each of said retaining portions (37, 237) and one of said inner ring (5, 205) and said outer ring (3, 203) in a radial direction, and configured to transmit a second torque from said retaining portions (37, 237) to said corresponding first torque transmission members (19, 219) and to one of said inner ring and said outer ring when said retaining portions (37, 237) moves in said one circumferential direction, the second torque being transmitted from said retaining portions (37, 237) through said second torque transmission members (23, 223) to said first torque transmission members (19, 219) and moving said first torque transmission members (19, 219) to said torque transmission incapable positions. an inner ring (5, 205); an outer ring (3, 203) arranged coaxially with said inner ring; a plurality of first torque transmission members (19, 219) provided between said inner ring and said outer ring at predetermined circumferential intervals and configured to transmit a first torque between said inner ring and said outer ring; a plurality of spring members (41, 241) that bias said plurality of first torque transmission members to their respective torque transmission positions; a plurality of retaining portions (37, 237) arranged between the adjacent first torque transmission members (19, 219) in one-to-one correspondence with the first torque transmission members (19, 219) and configured to shift said corresponding first torque transmission members (19, 219) from said torque transmission positions to torque transmission incapable positions by moving in one circumferential direction toward said corresponding first torque transmission members (19, 219), to retain said first torque transmission members (19, 219) at said torque transmission incapable positions; characterized in that a second torque transmission member (23, 223) provided between each of said retaining portions (37, 237) and said first torque transmission members (19, 219) corresponding thereto in a circumferential direction, and provided between each of said retaining portions (37, 237) and one of said inner ring (5, 205) and said outer ring (3, 203) in a radial direction, and configured to transmit a second torque from said retaining portions (37, 237) to said corresponding first torque transmission members (19, 219) and to one of said inner ring and said outer ring when said retaining portions (37, 237) moves in said one circumferential direction, the second torque being transmitted from said retaining portions (37, 237) through said second torque transmission members (23, 223) to said first torque transmission members (19, 219) and moving said first torque transmission members (19, 219) to said torque transmission incapable positions.