The invention electric machine (電氣 機器; electric device) of maximizing the insulation efficiency as the generator rotor insulator (insulator) on the insulating material and method for producing a time advanced responsive excellent in heat resistance and heat generators electronic insulator and thus produced by built-in relates to an insulator generator rotor core slots, in the insulator for insulating the coil and the core, made of aromatic polyamide (aromatic polyamide) and a first sheet made of a sheet, the epoxy coated fiberglass (epoxy coated fiberglass) 2 sheet, and a polyamide (Kapton film) sheet third sheet and fourth sheet, and made of a fifth sheet made of an aromatic polyamide sheet coated with an epoxy resin adhesive to the opposite side of each sheet made with epoxy coated fiberglass made of They are joined to constitute the laminated sheet 10, the laminate Put between the upper and lower molds made of the agent to the slot-shaped clamping (C), and applied to a column of hot air chamber hot air chamber 160 ℃ by deforming the upper and lower mold of the primary machining step of forming 24 hours heat treatment, processing the primary characterized by comprising a vent hole (71) on the cut, and cutting the molded insulator (7) by a predetermined length by the insulator plurality of secondary machining step of the through-boring.