The invention relates to a lamp unit of a vehicle headlamp, which inhibits light distribution unevenness from happening when adopting a projection type lamp unit making a light-emitting element as light source as the lamp unit of the vehicle headlamp in the condition that the light-emitting element is provided with a construct of a plurality of light-emitting chips arranged according to a mode of being adjacent to each other in a vehicle width direction. A diffusing and reflecting portion (30) is formed in a position away from a rear focal point F of a self-projecting lens (12) of an upward reflecting surface (18a) of a mirror component (18) upward reflecting a part of reflected light from a reflector (16) to a rear side. Thereby, although the light-emitting element (14) is provided with the construct of a pair of light-emitting chips (14aL, 14aR) arranged according to the mode of being adjacent to each other in the vehicle width direction, the light-emitting element (14) is provided with the construct of a pair of light-emitting chips (14aL, 14aR) arranged according to the mode of being adjacent to each other in the vehicle width direction, the light-emitting element (14) can also make use of light formed by reflected light from a central reflecting region of right above an optical axis Ax of a reflecting surface (16a) near the reflector to prevent that a clearance (G) between the two light-emitting chips is as a longitudinal shadow projection.