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 . <EOS>