Provided is a high-performance persistent current switch that is provided with a superconducting coil in which a decrease of a critical current or a critical magnetic field is suppressed. A means for solving the problem is as follows. A persistent current switch provided with a superconducting coil in a switch unit. A superconducting coil 5 includes a winding portion 53 which is formed using a superconductor thin film formed on an outer circumferential face of a base member 50. The winding portion 53 includes a first winding portion 51 and a second winding portion 52 which are formed in a double helical shape to be parallel to each other. A terminating end portion 51b of the first winding portion 51 and a starting end portion 52a of the second winding portion 52, which are adjacent to each other, are connected to each other.

Provided is a high-performance persistent current switch that is provided with a superconducting coil in which a decrease of a critical current or a critical magnetic field is suppressed. A means for solving the problem is as follows. A persistent current switch provided with a superconducting coil in a switch unit. A superconducting coil 5 includes a winding portion 53 which is formed using a superconductor thin film formed on an outer circumferential face of a base member 50. The winding portion 53 includes a first winding portion 51 and a second winding portion 52 which are formed in a double helical shape to be parallel to each other. A terminating end portion 51b of the first winding portion 51 and a starting end portion 52a of the second winding portion 52, which are adjacent to each other, are connected to each other.