A manufacturing method for an electric wire with a terminal, the manufacturing method comprising: a crimping step for sandwiching and pressurizing, with a first die and a second die, an electric wire terminal of an electric wire including a core wire constituted of a plurality of elemental wires and a coating covering the core wire and an electric wire connection body of a terminal metal fitting including an inner wall surface on which the electric wire terminal is placed, calking and crimping a core wire connection body of the electric wire connection body onto a core wire exposed part of the core wire of the electric wire terminal, and calking and crimping a coating connection body connected to the core wire connection body of the electric wire connection body via a coupling body onto a coating terminal part of the coating of the electric wire terminal; a first resin supplying step for discharging a curable resin material for internal use through a discharge port at a nozzle distal end while pressing the nozzle distal end against an exposed part (111a 1) exposed from the electric wire connection body at the core wire exposed part after being caulked and crimped, and infiltrating the curable resin material for internal use into gaps between the elemental wires while pressing out air in the gaps at least at the core wire exposed part; a second resin supplying step for discharging a curable resin material for external use through the discharge port at the nozzle distal end to cover the core wire exposed part in which the curable resin material for internal use is filled into the gaps between the elemental wires, the core wire connection body, and the coating connection body, with the curable resin material for external use from the outside; and a resin curing step for curing the curable resin material for internal use and the curable resin material for external use by operating a resin curing device. a crimping step for sandwiching and pressurizing, with a first die and a second die, an electric wire terminal of an electric wire including a core wire constituted of a plurality of elemental wires and a coating covering the core wire and an electric wire connection body of a terminal metal fitting including an inner wall surface on which the electric wire terminal is placed, calking and crimping a core wire connection body of the electric wire connection body onto a core wire exposed part of the core wire of the electric wire terminal, and calking and crimping a coating connection body connected to the core wire connection body of the electric wire connection body via a coupling body onto a coating terminal part of the coating of the electric wire terminal; a first resin supplying step for discharging a curable resin material for internal use through a discharge port at a nozzle distal end while pressing the nozzle distal end against an exposed part (111a 1) exposed from the electric wire connection body at the core wire exposed part after being caulked and crimped, and infiltrating the curable resin material for internal use into gaps between the elemental wires while pressing out air in the gaps at least at the core wire exposed part; a second resin supplying step for discharging a curable resin material for external use through the discharge port at the nozzle distal end to cover the core wire exposed part in which the curable resin material for internal use is filled into the gaps between the elemental wires, the core wire connection body, and the coating connection body, with the curable resin material for external use from the outside; and a resin curing step for curing the curable resin material for internal use and the curable resin material for external use by operating a resin curing device.