A cutting method for manufacturing a magnet piece forming a magnet body for a field pole to be arranged in a rotating electric machine by cutting a permanent magnet body, the permanent magnet body being coated on a surface with a deterioration preventive coating film, and the cutting method comprising: - forming a cutout groove along a cutting planned position on at least one surface of the permanent magnet body including a deterioration preventive coating film on a surface at the cutting planned position extending in a width direction of the magnet body; - in a state where the magnet body is supported at two support points (61, 62) from the lower side while the cutout groove is being placed to face a side of the two support points (61, 62), feeding the magnet body in a feeding direction to a position where the cutout groove is arranged between both the support points (61, 62), the feeding direction being perpendicular to the width direction of the magnet body; and - cutting the magnet body into a cut magnet body and a magnet piece by pressing the magnet body by a blade (43, 63) from an upper side of the magnet body, characterized in - that cutting is performed at a position that is offset rearward to the feeding direction from a position corresponding to the cutout groove arranged between both of the support points (61, 62) by a predetermined offset amount, such that the magnet piece is smaller than the cut magnet body, and - that the predetermined offset amount has a size (i) such that the magnet piece and the blade (43, 63) do not contact each other at the time of cutting the magnet body into the cut magnet body and the magnet piece, and (ii) such that after cutting a movement of the magnet piece cut is not restricted by the blade (43, 63). - forming a cutout groove along a cutting planned position on at least one surface of the permanent magnet body including a deterioration preventive coating film on a surface at the cutting planned position extending in a width direction of the magnet body; - in a state where the magnet body is supported at two support points (61, 62) from the lower side while the cutout groove is being placed to face a side of the two support points (61, 62), feeding the magnet body in a feeding direction to a position where the cutout groove is arranged between both the support points (61, 62), the feeding direction being perpendicular to the width direction of the magnet body; and - cutting the magnet body into a cut magnet body and a magnet piece by pressing the magnet body by a blade (43, 63) from an upper side of the magnet body, - that cutting is performed at a position that is offset rearward to the feeding direction from a position corresponding to the cutout groove arranged between both of the support points (61, 62) by a predetermined offset amount, such that the magnet piece is smaller than the cut magnet body, and - that the predetermined offset amount has a size (i) such that the magnet piece and the blade (43, 63) do not contact each other at the time of cutting the magnet body into the cut magnet body and the magnet piece, and (ii) such that after cutting a movement of the magnet piece cut is not restricted by the blade (43, 63).