According to an embodiment, a driving device housing with an axial direction is provided. The driving device housing is made of permeability magnetic material and polygonal in outer shape. The driving device housing includes an outer peripheral side wall and a housing top wall connected to a front side of the outer peripheral side wall. The housing top wall includes an opening allowing light to pass through. The housing further includes at least one step portion at each corner portion thereof. The step portion includes a step horizontal wall extending in a direction intersecting with the axial direction and a step vertical wall extending from the step horizontal wall toward a front side or a rear side. A magnet mounting portion is formed by an inner peripheral wall surface of the step vertical wall and an inner peripheral wall surface of the outer peripheral side wall adjacent thereto.