A vehicular headlamp comprising: a first light distribution portion including a first light source, the first light distribution portion being configured to distribute, toward a vehicle front side, light projected by the first light source; a second light distribution portion including a second light source and an micro electro mechanical system mirror, the second light distribution portion being configured to distribute light toward the vehicle front side with a predetermined light distribution pattern by reflecting, by the micro electro mechanical system mirror, light projected by the second light source; and a holding member configured to hold the first light source, the second light source, and the micro electro mechanical system mirror, characterized in that, the vehicular headlamp further comprises: a single lens including a first lens portion and a second lens portion, the first lens portion being constituting a vehicle-front-side portion of the first light distribution portion and configured such that the light projected by the first light source is passed through the first lens portion, the second lens portion being constituting a vehicle-front-side portion of the second light distribution portion and configured such that the light reflected by the micro electro mechanical system mirror is passed through the second lens portion; and a separating wall formed in the holding member so as to protrude toward the vehicle front side relative to the holding member, the separating wall being configured to separate a region between the first lens portion and the holding member from a region between the second lens portion and the holding member, such that light projected from the first light source is restrained from passing through the second lens portion of the lens, and light projected by the second light source and reflected by the micro electro mechanical system mirror is restrained from passing through the first lens portion of the lens. a first light distribution portion including a first light source, the first light distribution portion being configured to distribute, toward a vehicle front side, light projected by the first light source; a second light distribution portion including a second light source and an micro electro mechanical system mirror, the second light distribution portion being configured to distribute light toward the vehicle front side with a predetermined light distribution pattern by reflecting, by the micro electro mechanical system mirror, light projected by the second light source; and a holding member configured to hold the first light source, the second light source, and the micro electro mechanical system mirror, a single lens including a first lens portion and a second lens portion, the first lens portion being constituting a vehicle-front-side portion of the first light distribution portion and configured such that the light projected by the first light source is passed through the first lens portion, the second lens portion being constituting a vehicle-front-side portion of the second light distribution portion and configured such that the light reflected by the micro electro mechanical system mirror is passed through the second lens portion; and a separating wall formed in the holding member so as to protrude toward the vehicle front side relative to the holding member, the separating wall being configured to separate a region between the first lens portion and the holding member from a region between the second lens portion and the holding member, such that light projected from the first light source is restrained from passing through the second lens portion of the lens, and light projected by the second light source and reflected by the micro electro mechanical system mirror is restrained from passing through the first lens portion of the lens.