Vehicular lighting device

A vehicular lighting device (100) includes a first lighting unit (1), a second lighting unit (2) connected to the first lighting unit (1), a heat dissipating member (4, 5) disposed on at least one of the first and second housings (11, 21) and having a plurality of heat dissipating fins (42), and a heat dissipating channel (3) formed between the first and second housings (11, 21) and having an air inlet (33) located at a front side of the vehicular lighting device (100) for communicating with ambient air, and an air outlet (34) located at a rear side of the vehicular lighting device (100).