LAMP FOR VEHICLES

A light source unit (20) provided with a light-emitting element as a light source is attached to a rear wall section (12c) of a housing (12). The light source unit (20) is attached to the housing (12), in the state where a socket (26) is inserted in an opening formed in the rear wall section (12c) and an elastic seal member (28) attached to the front end of the socket (26) is pressed against the rear wall section (12c). A rib (12c3) extending toward a lamp rear side so as to surround at least the upper half section of the opening is formed on the rear wall section (12c) of the housing (12).