The present invention is to fasten the end gear 21 is tapered in the present invention relates to a bumper of a car cover for the internal, in particular mounting the take-up roller 20 to the inside of a car bumper (2) and the axis (20a), the axis ( 20a) outside the drive shaft 41 is close to be decelerated Motor 40 is the installation, and mounting the drive gear 30 to the drive shaft 41 to form a drive shaft 41 by a spline, wherein the drive gear (30 ) is a gear portion (30a) inclined to the inside and outside this, and is fastened to the bearing 50, connected to the outer side of the bearing 50 and the solenoid valve 60 and open and close the front surface of the bumper (2) means as that can be solved by pulling the fastener 70 a to the drive and brake switches 81 and 82 wound on the car cover (1) is automatically in the take-up roller 20 by or covered with a hand installation (1) the cover (1) for a car is easy to keep the bumper (2) to cover the body while the right and remove the cover (1) It is easy to use.