A high beam unit 12 includes: a reflective mirror 30 having a reflective surface 32 that reflects light from a light source 44; a mirror member 58 on which the light reflected by the reflective surface 32 is incident which is capable of forming plural light distribution patterns, and which reflects the incident light in a vehicle forward direction; a lens 16 on which the light reflected by the mirror member 58 is incident and which projects that light in the vehicle forward direction; and a lens holding member 20 that is formed integrally with the reflective mirror 30 and supports the lens 16 in a support position P0 including a section of, or a section in a vicinity of, an outer peripheral portion of the lens 16 positioned on a plane orthogonal to the optical axis and passing through a center of gravity G.