A stacked rotor core of a motor, the rotor core comprising: a plurality of thin disk-shaped rotor core members; at least two magnet support rotor core members; a shaft hole penetratively formed at a center of the rotor core members and the magnet support rotor core members; a shaft press-fitted into the shaft hole; and a plurality of magnet insertion holes penetratively formed at a position near to a periphery of the rotor core member and the magnet support rotor core member for inserted coupling by a magnet; wherein each magnet insertion hole of each magnet support rotor core members is protrusively formed at the magnet insertion hole with a flange unit surface-contracting a wall surface of one side of the magnet and tightly contacting the magnet to a radial direction of the rotor core member, wherein each of the rotor core members are stacked at a predetermined height, and the magnet support rotor core members are respectively arranged at an upper surface and a bottom surface of the plurality of stacked rotor core members, and the shaft is press-fitted into the shaft hole, wherein the flange unit is formed at a surface near to the shaft hole in the inner circumferential of magnet insertion holes of magnet support rotor core members, the flange unit being formed with a width same as that of a surface opposite to the magnet, a distal end of which is bent, where a bent direction is an insertion direction of the magnet, wherein a length of the bent distal of the flange unit is at least three times the length of a thickness of the rotor core member, and wherein a distal end of the flange unit is roundly bent. a plurality of thin disk-shaped rotor core members; at least two magnet support rotor core members; a shaft hole penetratively formed at a center of the rotor core members and the magnet support rotor core members; a shaft press-fitted into the shaft hole; and a plurality of magnet insertion holes penetratively formed at a position near to a periphery of the rotor core member and the magnet support rotor core member for inserted coupling by a magnet; wherein each magnet insertion hole of each magnet support rotor core members is protrusively formed at the magnet insertion hole with a flange unit surface-contracting a wall surface of one side of the magnet and tightly contacting the magnet to a radial direction of the rotor core member, wherein each of the rotor core members are stacked at a predetermined height, and the magnet support rotor core members are respectively arranged at an upper surface and a bottom surface of the plurality of stacked rotor core members, and the shaft is press-fitted into the shaft hole, wherein the flange unit is formed at a surface near to the shaft hole in the inner circumferential of magnet insertion holes of magnet support rotor core members, the flange unit being formed with a width same as that of a surface opposite to the magnet, a distal end of which is bent, where a bent direction is an insertion direction of the magnet, wherein a length of the bent distal of the flange unit is at least three times the length of a thickness of the rotor core member, and wherein a distal end of the flange unit is roundly bent.