To provide an electric power steering device that does not require maintenance for a long time and achieves superior steering feeling and a low noise.

A first bearing 35 and second bearing 36 support a first end 14a and second end 14b of a worm 14. In a gear housing 10, a rigid member 51 disposed at a position opposite to a meshing region A with respect to the worm 14 abuts on the first bearing 35 and second bearing 36. A compression coil spring 52 as an elastic member energizes the rigid member 51 to a worm wheel 15 side at a position opposite to the meshing region A with respect to the worm 14. The compression coil spring 52 energizes both bearings 35 and 36 to the worm wheel 15 side via the rigid member 51 in a lump.