To adequately perform the belt winding control when returning a control unit from a waiting state to an operating state.

A control unit 81 of a vehicular seat belt device 30 is transferred to the waiting state of the low power consumption when an ignition switch 51 is changed from ON-state to OFF-state, and then, returned from the waiting state to the operating state when at least one of a plurality of return conditions is satisfied. The plurality of returning conditions include at least a first returning condition that the fitting state of a belt 31 is changed, and a second returning condition that the condition of a door is changed from a closed state to an open state. A returning state discrimination unit 66 discriminates whether the control unit is returned from the waiting state to the operating state according to which returning condition in the plurality of returning conditions. Based on the result of discrimination by the returning state discrimination unit, the control unit executes the restoration control of restoring a belt by a motor in different modes from each other.