A superconducting magnet device comprising a plurality of superconducting coils arranged concentrically with each other around a center axis (CL), wherein the plurality of superconducting coils include a plurality of first superconducting coils each formed by a tape wire , each of the plurality of first superconducting coils has a plurality of wire layers layered in a radial direction that is perpendicular to the direction of the center axis, each of the plurality of wire layers is formed of the tape wire spirally wound around the center axis a plurality of times, thereby providing a plurality of turns, wherein the plurality of first superconducting coils include a radially innermost superconducting coil , a radially outermost superconducting coil and radially middle superconducting coils that are sandwiched between the innermost superconducting coil and the outermost superconducting coil and radially disposed on each other, wherein the number of unit wire layer turns of a specific superconducting coil of the middle superconducting coils is smaller than a mean value of the respective numbers of unit wire layer turns of the plurality of first superconducting coils and than the respective numbers of unit wire layer turns of the innermost superconducting coil and the outermost superconducting coil, the number of unit wire layer turns of each of the first superconducting coils being expressed by the mean value of the respective numbers of turns of the tape wire per wire layer in the plurality of wire layers of the respective one of the first superconducting coils, wherein the specific superconducting coil is selected from the middle superconducting coils, being radially disposed on each other, such that compressive force acting in operation of the superconducting magnet device on the specific superconducting coil in a direction, in which the center axis extends, would be the largest of the plurality of first superconducting coils if the respective numbers of unit wire layer turns of the plurality of first superconducting coils were the same. the plurality of superconducting coils include a plurality of first superconducting coils each formed by a tape wire , each of the plurality of first superconducting coils has a plurality of wire layers layered in a radial direction that is perpendicular to the direction of the center axis, each of the plurality of wire layers is formed of the tape wire spirally wound around the center axis a plurality of times, thereby providing a plurality of turns, wherein the plurality of first superconducting coils include a radially innermost superconducting coil , a radially outermost superconducting coil and radially middle superconducting coils that are sandwiched between the innermost superconducting coil and the outermost superconducting coil and radially disposed on each other, wherein the number of unit wire layer turns of a specific superconducting coil of the middle superconducting coils is smaller than a mean value of the respective numbers of unit wire layer turns of the plurality of first superconducting coils and than the respective numbers of unit wire layer turns of the innermost superconducting coil and the outermost superconducting coil, the number of unit wire layer turns of each of the first superconducting coils being expressed by the mean value of the respective numbers of turns of the tape wire per wire layer in the plurality of wire layers of the respective one of the first superconducting coils, <EOS>