A vehicular lamp fitting, comprising: a projection lens; a separator that is disposed behind the projection lens; a low beam light source that is disposed behind the separator, and emits light which passes through the separator and the projection lens in sequence, and is irradiated forward to form a low beam light distribution pattern, further comprising an adaptive driving beam, ADB, light source that emits light which passes through the separator and the projection lens in sequence, and is irradiated forward to form an ADB light distribution pattern, wherein the separator includes: an upper separator main body constituted by a front surface and a back surface on the opposite side of the front surface; a first light guiding unit which extends from a lower portion of the upper separator main body toward the low beam light source, and has a first entry surface facing the low beam light source at the front end; a lower separator main body constituted by a front surface and a back surface on the opposite side of the front surface; and a second light guiding unit which extends from an upper portion of the lower separator main body toward the ADB light source, and has a second entry surface facing the ADB light source at the front end, wherein the projection lens includes a front surface and a back surface (60Ab1, 60Ab2) on the opposite side of the front surface, wherein the back surface of the projection lens includes an upper entry surface (60Ab1) facing the front surface of the upper separator main body, and a lower entry surface (60Ab2) facing the front surface of the lower separator main body, wherein the low beam light source, the first light guiding unit, the upper separator main body and the upper entry surface are disposed above a reference axis, which passes through a focal point of the projection lens and extends in the longitudinal direction of the vehicle, wherein the ADB light source, the second light guiding unit, the lower separator main body and the lower entry surface are disposed below the reference axis, and wherein when it is assumed that a first region is a lower portion of an upper entry surface of the projection lens and an upper portion of a lower entry surface of the projection lens, a second region is a portion above the lower portion of the upper entry surface of the projection lens, and a third region is a portion below the upper portion of the lower entry surface of the projection lens, the first region matches the focal plane of the projection lens, the second region is disposed ahead of or behind the focal plane of the projection lens, and the third region is disposed ahead of or behind the focal plane of the projection lens; wherein the lower portion of the front surface of the upper separator main body is surface-contacted with the lower portion of the upper entry surface of the projection lens, wherein a space is formed between a portion above the lower portion of the front surface of the upper separator main body and a portion above the lower portion of the upper entry surface of the projection lens, and wherein the front surface of the lower separator main body is surface-contacted with the lower entry surface of the projection lens. the first region matches the focal plane of the projection lens, the second region is disposed ahead of or behind the focal plane of the projection lens, and the third region is disposed ahead of or behind the focal plane of the projection lens;