To provide a control circuit of a vehicular lightning device in which energization to all light sources is interrupted when energization to at least one light source is interrupted, and to provide the vehicular lightning device including the control circuit.

Three first LEDs 11 and the gate 19a of a first field-effect transistor 19 are serially connected on one electric wire 14 so as to form a first emission circuit 201. Three second LEDs 12 and the gate 22a of a second field-effect transistor 22 are serially connected on the other electric wire 15 so as to form a second emission circuit 201. The vehicular lightning device is characterized in that wiring 14b branched and extended from wiring 14a connecting the respective first LEDs 11 and the gate 19a of the first field-effect transistor is connected to the drain 22b of the second field-effect transistor 22, and wiring 15b branched and extended from wiring 15a connecting the respective second LEDs 12 and the gate 22a of the second field-effect transistor is connected to the drain 19b of the first field-effect transistor 19.