A handle assembly has a handle arm, a knob shaft and a handle knob that includes a tubular portion and a substantially spherical knob portion. The tubular portion is mounted on an outer peripheral surface of the knob shaft. The knob portion is unitarily formed with the tubular portion. The knob portion has a first knob with a substantially spherically shaped outer peripheral surface and a second knob that is disposed on a side of the first knob opposite the handle arm. The second knob has a substantially spherically shaped outer peripheral surface with a diameter larger than a diameter of the first knob. The second knob is unitarily linked with the first knob at a junction a distance from the outermost radial portion at a region of the knob portion opposite the tubular portion.