LIGHT EMISSION DEVICE

PROBLEM TO BE SOLVED: To provide a technology for allowing a light emission device in which a plurality of circuit blocks each having a different number of serially connected LEDs are connected in parallel to uniformly emit light with a small number of components.SOLUTION: A light emission device includes: a transistor 100; a first circuit part having a plurality of serially connected light emission elements 11, 12, 13, 21, 22 and 23 with one ends connected to a high potential end +V of a power source and with the other ends connected to a reference potential end GND of the power source; and a second circuit part having a smaller number of serially connected light emission elements 32, 33, 42 and 43 than the first circuit part with one ends connected to the emitter of the transistor and with the other ends connected to a reference potential end. The first circuit part has a node A between the light emission elements at the reference potential end side equal in number to the second circuit part and the other light emission elements at a high potential end side. The transistor is configured such that the base is connected to the node A of the first circuit part, and that the collector is connected to a high potential end.