A magnetic property determination apparatus configured to detect a magnetic material included in a paper sheet transported through a transport path and to differentiate and determine from one another a high-coercive force magnetic material, a middle-coercive force magnetic material and a low-coercive force magnetic material, each having different coercive force, the apparatus comprising: a magnetic detection unit configured to generate on the transport path a bias magnetic field having a magnetic field direction inclined to a transport surface of the paper sheet by a specific angle and, at a position on the transport path, to detect the magnetic charge of the magnetic material by detecting variation of the bias magnetic field; and a magnetization unit that is arranged upstream of the magnetic detection unit in a transport direction and is configured to magnetize the magnetic material by generating on the transport path a magnetization magnetic field having a magnetic field direction oriented in a direction different from the direction of the bias magnetic field, wherein at the position on the transport path at which the magnetic detection unit in use detects the magnetic charge of the magnetic material, included in a paper sheet transported through the transport path, by detecting variation of the bias magnetic field, each of the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material is in a state in which the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material are magnetized in mutually different magnetization directions according to coercive force thereof, and the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material are differentiated and determined from one another based on detection results of the magnetic materials. a magnetic detection unit configured to generate on the transport path a bias magnetic field having a magnetic field direction inclined to a transport surface of the paper sheet by a specific angle and, at a position on the transport path, to detect the magnetic charge of the magnetic material by detecting variation of the bias magnetic field; and a magnetization unit that is arranged upstream of the magnetic detection unit in a transport direction and is configured to magnetize the magnetic material by generating on the transport path a magnetization magnetic field having a magnetic field direction oriented in a direction different from the direction of the bias magnetic field, wherein at the position on the transport path at which the magnetic detection unit in use detects the magnetic charge of the magnetic material, included in a paper sheet transported through the transport path, by detecting variation of the bias magnetic field, each of the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material is in a state in which the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material are magnetized in mutually different magnetization directions according to coercive force thereof, and the high-coercive force magnetic material, the middle-coercive force magnetic material and the low-coercive force magnetic material are differentiated and determined from one another based on detection results of the magnetic materials.