To solve a problem that a rotation of an optical axis is not coincident with an actual circumstance in the case of an extremely low speed including stopping and a high speed since the rotation of the optical axis is carried out only by an information from a steering device in a conventional variable light distribution head lamp system.

A speed signal is inputted to a control means of the variable light distribution head lamp system 1 and the control means 4 carries out a restriction of a function or an addition of the function against a light distribution change means 3 when a predetermined speed is detected at the speed signal. Therefore, a problem generated at the time of extremely low speed including stopping and a high speed is solved by also referring to a traveling speed.