The present disclosure provides an automobile reducer including a worm shaft bearing including an inner race coupled to an end of a worm shaft, which meshes with a worm wheel, an outer race coupled to an inner surface of a gear housing, and a ball coupled between the inner race and the outer race; a motor boss having a coupling hole formed on one side, a motor shaft of a motor being inserted into the coupling hole, and an insertion hole formed on the other side, the worm shaft being inserted into the insertion hole; and a damping member coupled between a side surface of the inner race and a side surface of the motor boss and elastically supported in an axial direction.