A webbing retractor is provided with a lock mechanism. The webbing retractor further comprises a bobbin, a webbing-holding member and a webbing. The bobbin has a drum portion and a pair of flanges arranged on opposite ends of the drum. The flanges define grooves formed in a mutually-opposing relationship and angularly extending over a predetermined length in a webbing-releasing direction as a first direction of rotation. The webbing-holding member extends between the grooves. The webbing is secured at one end thereof in the bobbin, wound back about the webbing-holding member at a first portion thereof apart from the one end thereof toward an opposite end thereof, and then wound in layers around the drum portion in the first direction of rotation at a second portion thereof closer to the opposite end than the first portion.