Abstract: Provided are a vehicle lighting device and a vehicle lamp that can maintain lighting even when an input voltage drops. The vehicle lighting device according to an embodiment includes a socket; a substrate provided on one end side of the socket; a first circuit provided on the substrate; and a second circuit provided on the substrate. The first circuit has a plurality of first light emitting elements; and a control element electrically connected to the plurality of first light emitting elements and controlling a value of a current flowing through the plurality of first light emitting elements. The second circuit has second light emitting elements the number of which is smaller than the number of the plurality of first light emitting elements; and a resistor connected in series to the second light emitting elements.

Abstract: A vehicle lighting device and a vehicle lamp are provided. The vehicle lighting includes a socket; a substrate provided on one end portion side of the socket; light emitting elements provided on the substrate; and a control element provided on the substrate and electrically connected to the light emitting elements. The control element turns on some of the light emitting elements when the input voltage is lower than a first voltage; turns on all of the light emitting elements when the input voltage exceeds a second voltage higher than the first voltage; and turns on all of the light emitting elements and changes at least one of total luminous flux of the light emitting elements and current flowing through the light emitting elements according to the input voltage when the input voltage is equal to or higher than the first voltage and equal to or lower than the second voltage.

Abstract: Provided are a vehicle lighting device and a vehicle lamp that can maintain lighting even when an input voltage drops. The vehicle lighting device according to an embodiment includes a socket; a substrate provided on one end side of the socket; a first circuit provided on the substrate; and a second circuit provided on the substrate. The first circuit has a plurality of first light emitting elements; and a control element electrically connected to the plurality of first light emitting elements and controlling a value of a current flowing through the plurality of first light emitting elements. The second circuit has second light emitting elements the number of which is smaller than the number of the plurality of first light emitting elements; and a resistor connected in series to the second light emitting elements.