Patent ID: 7621478

Claim:
A webbing retractor device, comprising: a spool that winds up a long belt-shaped webbing belt from an anchor end side thereof by rotating around its own axis in one direction which is a retraction direction; a rotating body that is axially supported at the spool so as to be able to follow the rotation of the spool, in a state in which it is relatively rotatable to a predetermined angle with respect to the spool; a lock member provided at the spool in a state of engagement with the rotating body; a projection formed to project from a main body portion of the lock member toward the rotating body; a guide portion formed at the rotating body so as to allow insertion of the projection thereinside, an inner wall of which guides the projection when the spool rotates in the pull-out direction relative to the rotating body, and which causes the lock member to be displaced in a direction of locking of the spool, wherein a holding portion is formed at the rotating body so as to allow insertion of the projection thereinside, the holding portion being continuous and aligned with the guide portion so as to allow reciprocal movement of the projection between the holding portion and the guide portion, and wherein an inner wall of the holding portion, which receives a pressing force derived from centrifugal force from the projection, faces the inner direction in the radial direction of the rotation of the spool or a direction inclined toward the retraction direction with respect to the inner direction in the radial direction of the rotation of the spool so as to prevent movement of the projection along the inner wall of the guide portion when the spool rotates in a retraction direction.