To provide a vehicular lighting fixture capable of surely emitting heat generated by a light source unit to the outside of a lamp chamber by an inexpensive and simple constitution.

A heat transfer body 20 constituted by elastically holding a heat transfer material 22 on a resin material 21 having flexibility is interposed between an LED substrate 11 and a back cover 7, and the LED substrate 11 and the back cover 7 are thermally connected to each other via the hear transfer body 20. As a result, the heat generated by the light source unit 10 can be surely emitted to the outside of the lamp chamber 2 by a simple and inexpensive constitution. In other words, the heat transfer body 20 is inexpensively obtained, and easy in molding by being composed mainly of the resin material 21. The heat transfer material 22 can be interposed between the LED substrate 11 and the back cover 7 so as to be changeable according to the tilting state of the light source unit 10 by elastically holding the heat transfer material 22 on the resin material 21.