A first light on/off check portion 3 checks the on/off of a light depending on the brightness, and a second light on/off check portion 9 checks the on/off of the light depending on the rain. A light control portion 10, when the rain-dependent on/off check shows the turn-on of the light, turns on a head lamp to avoid the visibility difficulty caused by the rain and, when the rain-dependent on/off check shows the turn-off of the light, according to the result of the check of the brightness-dependent on/off of the light, controls the head lamp and small lamp. A running scene check portion 8 checks the states of the inside and outside of a tunnel, and the second light on/off check portion 9, when the rain-dependent on/off check shows the turn-on of the light, continues the turn-on of the light on/off check for a given time.