A driving device which is capable of delivering higher power and can be reduced in size. A hollow-cylindrical magnet (1) is magnetized so as to have circumferentially alternately different poles. First and second coils (2 and 3) are arranged concentric with the magnet (1) on respective axially opposite sides thereof. Tooth-shaped first and second outer magnetic pole parts (8A, 8B, 8C, 8D, 9A, 9B, 9C, and 9D) are arranged in opposed relation to the magnet (1) to extend from respective opposite end faces of the magnet (1), for being magnetized by the first and second coils (2 and 3). A rotary shaft (10) fixed to an inner periphery of the magnet (1) is formed with an inner magnetic pole part (10A) disposed in opposed relation to the first and second outer magnetic pole parts (8A, 8B, 8C, 8D, 9A, 9B, 9C, and 9D), for being magnetized by the first and second coils (2 and 3). The first and second outer magnetic pole parts (8A, 8B, 8C, 8D, 9A, 9B, 9C, and 9D) are each formed into a spiral shape.