An apparatus for manufacturing the ends of electric cables, which comprises a section for injection molding on at least one end, a first section comprising means for applying electrical connection elements to one end of the cable and, optionally, a second section for applying further electrical connection elements to the remaining end of the cable, and means for testing the cable prior to its output from the apparatus, in which retaining means for both ends of the cables in all the manufacturing sections and means for moving said ends from the retaining means of one section to the retaining means of the next section are also present. The molding section comprises a plurality of molds, with an injector for each mold, mounted on platform with which they can be rotated along a circumference.