To offer a device for fastening a wheelchair in the car, having high workability and controlling the rocking of the retractor body during the use of the device.

The device includes a restraint mechanism 22 for fastening the wheelchair 13 in the car by using the withdrawal power 51 of a retractor belt 43 extended from the retractor body 42 of the retractor 41. The distal end of retractor belt 43 is fixed at a floor 11. A hook 83 to be engaged with the frame 21 of the wheelchair 13 is rotatably provided to the retractor body 42. The rotation direction of the hook 83 is controlled by a stopper 121.