Lamp unit for vehicular headlamp, and vehicular headlamp

A lamp unit for a vehicular headlamp mounted on a front part of a vehicle, the lamp unit comprising:

• a light source including a plurality of light-emitting elements arrayed in a horizontal direction from left to right;
• a lens arranged in front of the light source;
• and
• an inner reflecting surface provided further on an inner side of the vehicle than the plurality of light-emitting elements, wherein
• the inner reflecting surface reflects light from an innermost light-emitting element located furthest to the inner side of the vehicle among the plurality of light-emitting elements, as reflected light onto the lens, and
• the lens emits light from the plurality of light-emitting elements toward a front of the vehicle in a plurality of partial light distribution patterns arrayed in the horizontal direction from left to right, and emits the reflected light from the inner reflecting surface toward the front of the vehicle as a diffused light distribution pattern, so that the diffused light distribution pattern is superimposed on an outermost partial light distribution pattern located furthest on an outer side of the vehicle among the plurality of partial light distribution patterns, and so that an edge of the diffused light distribution pattern on an outer side of the vehicle is located further on the outer side of the vehicle than an edge of the outermost partial light distribution pattern on the outer side of the vehicle.