A propulsion apparatus for ships including a front propeller and a rear propeller to rotate in opposite directions and adapted to provide propulsion power to propel a hull of a ship, the propulsion apparatus comprising: a power unit to supply power to rotate the rear propeller; a main shaft to transfer the power supplied from the power unit to the rear propeller; a hollow shaft extending in a longitudinal direction of the main shaft to allow the main shaft to pass therethrough and coupled to the front propeller; a drive motor comprising a rotor coupled to an outer circumferential surface of the hollow shaft and a stator supported by the hull, the drive motor rotating the hollow shaft in a direction opposite to a direction of rotation of the main shaft; and an electricity supply unit to supply electricity to the drive motor, wherein the drive motor is a superconducting motor, and the rotor of the drive motor comprises: a superconducting coil; and a cooling chamber (241 b) to accommodate coolant to cool the superconducting coil; wherein the propulsion apparatus further comprises a coolant supply unit to supply coolant to the cooling chamber, the coolant supply unit comprises: a housing comprising a first housing allowing the main shaft to rotatably pass therethrough, and a second housing fixed to the hull and rotatably coupled to the first housing to define a coolant accommodation portion for accommodation of the coolant in conjunction with the first housing; and a connection line to connect the coolant accommodation portion and the cooling chamber to each other, the connection line being coupled to the first housing. a power unit to supply power to rotate the rear propeller; a main shaft to transfer the power supplied from the power unit to the rear propeller; a hollow shaft extending in a longitudinal direction of the main shaft to allow the main shaft to pass therethrough and coupled to the front propeller; a drive motor comprising a rotor coupled to an outer circumferential surface of the hollow shaft and a stator supported by the hull, the drive motor rotating the hollow shaft in a direction opposite to a direction of rotation of the main shaft; and an electricity supply unit to supply electricity to the drive motor, wherein the drive motor is a superconducting motor, and the rotor of the drive motor comprises: a superconducting coil; and a cooling chamber (241 b) to accommodate coolant to cool the superconducting coil; wherein the propulsion apparatus further comprises a coolant supply unit to supply coolant to the cooling chamber, the coolant supply unit comprises: a housing comprising a first housing allowing the main shaft to rotatably pass therethrough, and a second housing fixed to the hull and rotatably coupled to the first housing to define a coolant accommodation portion for accommodation of the coolant in conjunction with the first housing; and a connection line to connect the coolant accommodation portion and the cooling chamber to each other, the connection line being coupled to the first housing. a superconducting coil; and a cooling chamber (241 b) to accommodate coolant to cool the superconducting coil; wherein the propulsion apparatus further comprises a coolant supply unit to supply coolant to the cooling chamber, the coolant supply unit comprises: a housing comprising a first housing allowing the main shaft to rotatably pass therethrough, and a second housing fixed to the hull and rotatably coupled to the first housing to define a coolant accommodation portion for accommodation of the coolant in conjunction with the first housing; and a connection line to connect the coolant accommodation portion and the cooling chamber to each other, the connection line being coupled to the first housing. a housing comprising a first housing allowing the main shaft to rotatably pass therethrough, and a second housing fixed to the hull and rotatably coupled to the first housing to define a coolant accommodation portion for accommodation of the coolant in conjunction with the first housing; and a connection line to connect the coolant accommodation portion and the cooling chamber to each other, the connection line being coupled to the first housing.