To solve a problem that, in a headlight adopting a reflective mirror formed of a conventional BMC resin, a glass fiber in the resin is dissociated and scattered during operation for changing irradiation directions such as aiming, to spoil a fine sight of the reflective face or to cause the generation of glare.

In this vehicular lighting tool with a main-beam reflective face and a low-beam tool mounting part integrally formed of a resin member as a tool holder of which the low-beam tool mounting part of the tool holder has a low-beam reflective face, a ball joint, and an adjusting nut mounting part screwed with an adjustment screw for effecting aiming, the ball joint and the adjusting nut mounting part are formed of integral metal materials given positions so as to be mounted to the low-beam tool mounting part as an aiming unit.