An injection molding device includes: a material storage unit storing a material; a drive motor; a plasticization unit including a rotor that rotates by rotation of the drive motor, a barrel facing the rotor, and a heater, and configured to plasticize and flow out the material supplied from the material storage unit; a nozzle through which the material after plasticization is injected toward a mold from the plasticization unit; and a material drying unit configured to collect waste heat of the drive motor and dry the material in the material storage unit.