A light-bulb socket has two main parts, namely a socket cup having a base provided with a pair of upwardly exposed contacts and formed with a plurality of throughgoing mounting holes and a base disk fitted tightly to the base of the cup and formed with passages through which conductors connected to the contacts can pass. The base disk is unitarily formed with a pair of mounting sleeves projecting upward through the mounting holes of the cup. The sleeves are formed as short tubes that are a tight force fit in the mounting holes and are each formed with a deformable rib to enhance the tight fit.