VEHICULAR SEAT BELT DEVICE

A vehicular seat belt device includes a first pretensioner provided in a retractor and configured to apply tensile force to a shoulder belt portion of a webbing, a second pretensioner provided in a belt anchor part and configured to apply tensile force to a lap belt portion of the webbing, a third pretensioner provided in a side portion of the vehicle seat opposite to the belt anchor part and configured to apply tensile force to the lap belt portion via a buckle, and a controller. The controller is configured to activate the first pretensioner at a time of predicting vehicle collision, and activate the second pretensioner and the third pretensioner after detection of collision.