To provide a vehicular lighting fixture which suppresses changes in air pressure within a case due to temperature change and eliminates contamination or blurring caused by dust or steam within it.

A vehicular lighting fixture 10 comprises a case 11 whose front side is open, a light source 12 which is so arranged in the case as to radiate light frontward, and a front surface lens 14 of translucent material that tightly closes the open front surface at the case. The vehicular lighting fixture 10 comprises a core 15 connected in airtight to connection parts 11a and 11b, respectively, that are provided to communicate with the interior at the upper part and the lower part of the case.