In a lamp including a lamp housing and a lamp cover, the lamp cover is laser-beam welded to an opening edge portion of the lamp housing. There exists no trace of fusion on the opening edge portion of the lamp housing in any other areas than a surfaces abutment portion where the lamp cover is brought into abutment. A method for fabricating a lamp includes bringing a lamp cover into abutment with an opening edge portion of a lamp housing; and emitting a laser beam to a surfaces abutment portion of the lamp housing with the lamp cover so as to laser-beam weld the lamp housing and the lamp cover together. The emission of the laser beam is implemented while blocking the laser beam so that the laser beam is not emitted to at least any other areas of the opening edge portion than the surfaces abutment portion. An apparatus for fabricating a lamp includes support means for rotatably supporting a lamp housing and a lamp cover that is brought into abutment with an opening edge portion of the lamp housing in an abutment state; laser beam emitting means for emitting a laser beam to a surfaces abutment portion of the opening edge portion where the lamp housing is in abutment with the lamp cover; and laser beam blocking means for blocking the emission of a laser beam to at least any other areas of the opening edge portion than the surfaces abutment portion.