Brake device

A brake device comprising:

• a rotating member configured to be rotated by torque transmitted from a drive force source;
• a fixed member disposed to face the rotating member;
• a pressing member configured to generate an engaging force between the rotating member and the fixed member by being pressed in an axial direction of a rotation axis of the rotating member;
• an elastic member configured to apply an elastic force against a pressing of the pressing member to the pressing member;
• an engaging force application mechanism configured to apply the engaging force to the pressing member;
• a torque transmission member configured to transmit torque transmitted from the rotating member to the fixed member, the fixed member including a play along a rotation direction of the rotating member;
• a torque receiving member configured to receive the torque transmitted from the torque transmission member, rotation of the torque receiving member in a circumferential direction about the axis being blocked;
• a conversion mechanism configured to convert the torque received by the torque receiving member into thrust in the axial direction and apply the thrust resulting from the conversion to the engaging force;
• and
• an actuator configured to move the torque receiving member in the axial direction by generating thrust resulting from rotational-to-linear motion conversion in the torque receiving member and adjust a position of the torque receiving member along the axial direction based on a reaction force against the engaging force.