Abstract: A headlamp includes a lamp housing defining a lamp body and a front lens. A reflector is accommodated in the lamp housing and a light source is attached thereto. An aiming mechanism tiltably supports the reflector relative to the lamp body, and includes an aiming fulcrum, aiming screws, and nut members attached to the reflector. The nut members are guided by sliding guides in the lamp body, and stress releasing devices having a ball-and-socket joint structure are provided in an attachment portion of the nut members and brackets. A ball portion of a ball-and-socket joint is formed in a nut member body itself provided with a female screw portion, a slider supported by the sliding guides is formed integrally with a side of the ball portion, and the ball portion is supported on a ball receiving portion of bearings attached to the brackets.

Abstract: A compact reflector movable type headlamp which can reliably prevent the vibration of a reflector, can maintain the smooth rotation of an aiming screw, and furthermore, can prevent the shape of the reflector and the structure of a mold for reflector molding from being complicated. The headlamp includes a lamp body and a front lens which constitute a lamp housing. A reflector is accommodated in the lamp housing to which a light source attaches. An aiming mechanism serves to tiltably support the reflector with respect to the lamp body. The aiming mechanism is constituted by an aiming fulcrum, aiming screws, and nut members attached to the reflector and screwed into the aiming screws. The nut members are guided by sliding guides formed in the lamp body, and stress releasing means having a ball-and-socket joint structure are provided in an attachment portion of the nut members and brackets.