One-way clutch

A one-way clutch comprising:

• an inner ring;
• an outer ring arranged coaxially with said inner ring;
• a plurality of first torque transmission members provided between said inner ring and said outer ring at predetermined circumferential intervals and used to transmit a first torque between said inner ring and said outer ring;
• a plurality of spring members that bias said plurality of first torque transmission members to their respective torque transmission positions;
• a plurality of retaining portions arranged between the adjacent first torque transmission members in one-to-one correspondence with the first torque transmission members and capable of shifting said corresponding first torque transmission members from said torque transmission positions to torque transmission incapable positions by moving in one circumferential direction toward said corresponding first torque transmission members, and retaining said first torque transmission members at said torque transmission incapable positions;
• and
• a second torque transmission member provided between each of said retaining portions and said first torque transmission member corresponding thereto and used to transmit a second torque from said retaining portion to said corresponding first torque transmission member and to one of said inner ring and said outer ring when said retaining portion moves in said one circumferential direction.