Retractor and seat belt device

A seat belt device comprising a retractor including:

• a spool configured to wind up a webbing that restrains an occupant;
• a base frame configured to rotatably accommodate the spool;
• and
• a lock mechanism configured to restrict the rotation of the spool, wherein
• the lock mechanism includes a lock gear disposed coaxially with the spool so as to be rotatable relative to the spool, a pawl disposed so as to be engageable with the base frame, a flywheel disposed on the lock gear and configured to move the pawl by a relative rotation between the spool and the lock gear, and a hook spring that biases the flywheel in a direction opposite to a relative rotation direction during operation,
• the flywheel has a protrusion disposed at a distal end in the relative rotation direction, and
• the lock gear has a stopper that is in contact with the protrusion to tilt a posture of the flywheel during non-operation, and releases the contact with the protrusion during operation.