Vehicle headlamp

An optical unit (100) includes: a heat sink (130) that radiates heat from a light source; and a base portion (150) including a reflector mounting section (152), a lens mounting section (154) and a connecting section (156) connecting the reflector mounting section (152) and the lens mounting section (154). The base portion is configured such that the light from the light source is reflected by a reflector (110) mounted onto the reflector mounting section (152) and is incident onto a projection lens (102) mounted onto the lens mounting section (154). The heat sink (130) is exposed to a space surrounded by the lens mounting section (154), the connecting section (156) and the reflector mounting section (152).