A lighting/light-out control system of a lighting device for a vehicle, the lighting/light-out control system comprising: a plurality of semiconductor light source units having a light source and a switching regulator serving as a current control portion, respectively; and a control unit connected to the semiconductor light source units; wherein the control unit includes: a plurality of switch portions (SW2, 23, 34) connected to the semiconductor light source units and serving to control the semiconductor light source units, respectively; characterized by: a plurality of switch driving portions (7, 7A) for turning ON/OFF the switch portions (SW2, 23, 34), respectively; and a control portion is adapted to transmit a switch control signal upon receipt of a lighting/light-out control signal to the respective switch driving portion (7, 7A) thereby controlling each of the switch driving portions (7, 7A); and wherein each of the switch driving portions (7, 7A) comprises a lighting/light-out maintaining circuit (21, 31) each of the lighting/light-out maintaining circuits is adpated to - maintain a first signal output level at an output of the respective switch driving portion (7, 7A) for a first predetermined time being a time from a supply of a controlling source voltage (Vcc) to the control portion to a transmission of the switch control signal to the switch driving portion (7, 7A), whereby the first signal output level controls the switch portions (SW2, 23, 34), to maintain an OFF state during the first predetermined time; and to - maintain a second signal output level at the output of the respective switch driving portion (7, 7A) for a second predetermined time being a time from when the control portion is brought into a stopping state until a program processing of the control portion is then started, the second signal output level maintains the state of the switch portions (SW2, 23, 34) immediately before the stoppage of a driving operation of the control portion (CPU, 6), wherein each of the lighting/light-out maintaining circuits (21, 31) is a time constant circuit including a capacitor and a resistor and wherein the time constant of each of the lighting/light-out maintaining circuit (21, 31) is greater or equal to the first and second predetermined times. a plurality of semiconductor light source units having a light source and a switching regulator serving as a current control portion, respectively; and a control unit connected to the semiconductor light source units; a plurality of switch portions (SW2, 23, 34) connected to the semiconductor light source units and serving to control the semiconductor light source units, respectively; a plurality of switch driving portions (7, 7A) for turning ON/OFF the switch portions (SW2, 23, 34), respectively; and a control portion is adapted to transmit a switch control signal upon receipt of a lighting/light-out control signal to the respective switch driving portion (7, 7A) thereby controlling each of the switch driving portions (7, 7A); and wherein each of the switch driving portions (7, 7A) comprises a lighting/light-out maintaining circuit (21, 31) each of the lighting/light-out maintaining circuits is adpated to - maintain a first signal output level at an output of the respective switch driving portion (7, 7A) for a first predetermined time being a time from a supply of a controlling source voltage (Vcc) to the control portion to a transmission of the switch control signal to the switch driving portion (7, 7A), whereby the first signal output level controls the switch portions (SW2, 23, 34), to maintain an OFF state during the first predetermined time; and to - maintain a second signal output level at the output of the respective switch driving portion (7, 7A) for a second predetermined time being a time from when the control portion is brought into a stopping state until a program processing of the control portion is then started, the second signal output level maintains the state of the switch portions (SW2, 23, 34) immediately before the stoppage of a driving operation of the control portion (CPU, 6), - maintain a first signal output level at an output of the respective switch driving portion (7, 7A) for a first predetermined time being a time from a supply of a controlling source voltage (Vcc) to the control portion to a transmission of the switch control signal to the switch driving portion (7, 7A), whereby the first signal output level controls the switch portions (SW2, 23, 34), to maintain an OFF state during the first predetermined time; and to - maintain a second signal output level at the output of the respective switch driving portion (7, 7A) for a second predetermined time being a time from when the control portion is brought into a stopping state until a program processing of the control portion is then started, the second signal output level maintains the state of the switch portions (SW2, 23, 34) immediately before the stoppage of a driving operation of the control portion (CPU, 6), wherein each of the lighting/light-out maintaining circuits (21, 31) is a time constant circuit including a capacitor and a resistor and wherein the time constant of each of the lighting/light-out maintaining circuit (21, 31) is greater or equal to the first and second predetermined times.