To provide a compound apparatus with injection molding and cutting capable of manufacturing a product without using an intricate and precise mold in a short time.

The compound apparatus is characterized by comprising that a cutting tool and an injection molding nozzle unit (20) are detachably mountable on a main spindle (16), first the injection molding nozzle unit is detachably mounted on the main spindle (16) then an injection molding product is injection- molded, and next the injection molding nozzle unit mounted on the main spindle (16) is replaced with the cutting tool, the cutting tool is detachably mounted on the main spindle (16) and the injection molding product is cut with the cutting tool.