Patent ID: 7761207

Claim:
A seat belt device comprising: a spindle which winds a webbing; a winding spring which is coupled to the spindle and applies a winding force to the webbing: a power generating unit which generates a power for rotating the spindle in a desired direction; a rotary sensor which detects a rotation amount of the spindle; a power transmitting unit which is set to a power transmittable state when the power generating unit generates the power for rotating the spindle in a winding direction of the webbing, the power from the power generating unit being transmittable to the spindle in the power transmittable state, and is set to a power transmission disabled state when the power generating unit generates a power in a direction opposite to the power for rotating the spindle in the winding direction, the power from the power generating unit being disabled to be transmitted to the spindle in the power transmission disabled state; and a control unit which controls the power generating unit based on the rotation amount detected by the rotary sensor; wherein the control unit controls the power generating unit to rotate in the winding direction of the webbing when the rotary sensor detects that the webbing is wound by the winding spring.