Apparatus for manufacturing hollow elongated bodies, optionally tapered poles, made of reinforced synthetic resin: - an elongated mould having an internal surface configured for receiving reinforcing fibres and synthetic resin, said internal surface of the elongated mould having a tapered shape, optionally a frusto-conical one, - at least one actuating device configured for putting in rotation the mould around a prevalent development longitudinal axis of the mould itself, - at least one injection nozzle positioned and configured for introducing synthetic resin in said elongated mould, optionally wherein the injection nozzle is configured for operating at at least one longitudinal end of said mould, - a resin supplying device connected to the injection nozzle and configured for supplying synthetic resin at a liquid state to the injection nozzle, characterized in that the apparatus further comprises: - a temperature controlling group associated to the mould and in turn comprising: o a predetermined number of distributors of a thermoregulation fluid, positioned outside the mould and configured for directing the thermoregulation fluid at least towards predetermined portions of an external lateral surface of the mould itself, o a collecting unit positioned below the mould and configured for collecting the thermoregulation fluid, o a fluid circuit interposed between the collecting unit and the predetermined number of distributors, said fluid circuit being configured for conveying the thermoregulation fluid from the collecting unit towards the predetermined number of distributors, - a winder configured for receiving at least partially overlapped wound layers of a reinforcing fibrous material, wherein said elongated mould is open on at least one longitudinal end for enabling to respectively introduce into and extracting from said mould the winder. - an elongated mould having an internal surface configured for receiving reinforcing fibres and synthetic resin, said internal surface of the elongated mould having a tapered shape, optionally a frusto-conical one, - at least one actuating device configured for putting in rotation the mould around a prevalent development longitudinal axis of the mould itself, - at least one injection nozzle positioned and configured for introducing synthetic resin in said elongated mould, optionally wherein the injection nozzle is configured for operating at at least one longitudinal end of said mould, - a resin supplying device connected to the injection nozzle and configured for supplying synthetic resin at a liquid state to the injection nozzle, - a temperature controlling group associated to the mould and in turn comprising: o a predetermined number of distributors of a thermoregulation fluid, positioned outside the mould and configured for directing the thermoregulation fluid at least towards predetermined portions of an external lateral surface of the mould itself, o a collecting unit positioned below the mould and configured for collecting the thermoregulation fluid, o a fluid circuit interposed between the collecting unit and the predetermined number of distributors, said fluid circuit being configured for conveying the thermoregulation fluid from the collecting unit towards the predetermined number of distributors, o a predetermined number of distributors of a thermoregulation fluid, positioned outside the mould and configured for directing the thermoregulation fluid at least towards predetermined portions of an external lateral surface of the mould itself, o a collecting unit positioned below the mould and configured for collecting the thermoregulation fluid, o a fluid circuit interposed between the collecting unit and the predetermined number of distributors, said fluid circuit being configured for conveying the thermoregulation fluid from the collecting unit towards the predetermined number of distributors, - a winder configured for receiving at least partially overlapped wound layers of a reinforcing fibrous material, wherein said elongated mould is open on at least one longitudinal end for enabling to respectively introduce into and extracting from said mould the winder.