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PURPOSE : A holder for shielding a magnetic field is provided to prevent a noise from being generated and prevent the deterioration of a test device or a detection device by mounting a permanent magnet of a rare earth series on a plate to be a single body. CONSTITUTION : A permanent magnet of rare earth series(20) such as a both planes-multiple pole magnet is fixed on an upper side of a plate(10) by an adhesive. A holder main body(40) is mounted on the upper side of the plate(10) for shielding a magnetic force of the permanent magnet of the rare earth series(20). A shielding ribbon(50) formed by mixing and sintering boron of an amorphous phase with iron, is mounted to have a depth of 0.05 to 0.1mm on the inside of the holder main body(40). A groove(60) is formed on a surface of the plate(10). The adhesive is attached on the inside of the groove(60). A lower part of the permanent magnet is inserted into the groove(60). © KIPO 2006