Webbing retractor

A webbing retractor includes a take-up shaft (16), an inertia plate (52) provided integrally and coaxially with the take-up shaft (16), and an inertial force imparting mechanism (90). When a webbing for restraining a vehicle occupant is suddenly pulled-out, the take-up shaft (16) takes-up the webbing, and the inertia plate (52) causes a rotational delay with respect to the take-up shaft, and rotation of the take-up shaft in a webbing pull-out direction is thereby locked. Further, the inertial force imparting mechanism (90) that suppresses and deters rotation of the inertia plate (52) in a webbing take-up rotation direction by the inertial force imparting mechanism applying inertial force in a webbing pull-out rotation direction to the inertia plate (52) which attempts to rotate in a webbing take-up direction even after rotation of the take-up shaft in the webbing take-up rotation direction has stopped when a vehicle occupant cancels an applied state of the webbing and the entire webbing is taken-up.