A vehicle headlamp includes a lamp outer case 4, a holding plate 12, a lamp unit 6, and an optical axis adjustment mechanism 16. The lamp outer case 4 includes a lamp housing 2 formed with an opening on at least one side thereof and a cover 3 covers the opening of the lamp housing 2. The holding plate 12 is pivotable in at least one of an up-down direction and a right-left direction. The lamp unit 6 is attached to the holding plate 12 and includes a light source 10b. The optical axis adjustment mechanism 16 is disposed below the lamp unit 6 and adjusts an optical axis direction of the lamp unit 6.