A motor includes a rotary shaft, an armature part, a frame including a tubular portion surrounding the armature part, and a plurality of magnets. The tubular portion is formed of a magnetic body. The tubular portion includes a plurality of flat parts and a plurality of curved parts. Each of the plurality of flat parts and each of the plurality of curved parts being alternately arranged in a peripheral direction. On an inner surface of the tubular portion in each of the plurality of curved parts, a plurality of magnetic poles are provided. A magnetic gap is provided in a radial direction, the magnetic gap being formed by the inner surface of the tubular portion in each of the plurality of flat parts and the armature part.