A lighting unit includes a board on which a light emitting portion having a semiconductor light emitting device is arrayed on an upper side along the longitudinal direction. The lighting unit also includes a reflector which is disposed on the upper side of the board, and has a reflection portion inside the reflector for reflecting a light from the light emitting portion, as well as covering the light emitting portion. The lighting unit further includes a case disposed so as to support the board and the reflector from the top and the bottom.