[Object] To provide a magnetic material evaluation device with a simpler configuration that can evaluate a magnet by detecting the eddy current that is generated in a magnet. [Means to solve the problem] A magnetic material evaluation device 1characterized by comprising an excitation coil 12 that generates an alternating magnetic field that has a magnitude in a range that corresponds to the region including at least two adjacent magnetic pieces 101 of the magnet 102, which is made by bonding plural magnetic pieces 101 to sandwich an insulating material 103, and a detection coil 13 for detecting the eddy current that is generated in the magnetic piece 101 by the alternating magnetic field, in which the coil diameter of the detection coil 13 is smaller than the length of one magnetic piece 101 in the direction in which the plural magnetic pieces 101 are aligned.