Rotating electric machine rotor core and a manufacturing method thereof

A cylindrical rotary electric machine rotor core 10 of the magnet insertion holes 24, 26 are formed for inserting the permanent magnets therein while being constituted by connecting together by laminating electromagnetic steel plates in the axial direction, the magnet insertion holes 24 and 26 are formed open to the axial end of the outer circumferential surface 11c in the core inside the vicinity extends axially and rotor core 10 of the rotor core 10, axially outermost magnetic steel sheets forming the opening a plurality of electromagnetic steel plates containing is welded at the inner wall surface 42 of the magnet insertion holes 24, 26.