A magnetic fluid drive unit 100 having a double tube 10 comprising an inner tube 11 and an outer tube 12 formed on the outer side of the inner tube 11, and a magnetic field applicator 30 installed on the outer side of the double tube 10, the inner tube 11 having, in the region where a magnetic field is applied by the magnetic field applicator 30, a high heat conducting region 21 and a low heat conducting region 22 aligned in the lengthwise direction of the inner tube 11, the inside of the inner tube 11 being a heating medium flow path, and the area between the inner tube 11 and the outer tube 12 being a magnetic fluid flow path.