A head lamp device for wearing on a head and emitting lights outwardly is disclosed and comprises a cover member, a main control member, a sensing member, and at least two lamps. The main control member is mounted on the cover member. A receiving unit and a control unit are embedded in the main control member and electrically connected with each other wirelessly or wiredly. The sensing member is electrically connected with the main control member and installed in the cover member. The sensing member is detecting an inclined angle of the head and generating a signal for being transmitted to the main control member and received by the receiving unit. The lamps are electrically connected with the control unit. The lamps are controlled to turn on/off, adjust brightness, and change light-on/off priority by the control unit. The sensing member detects the change of the angle via moving the head.