A method for manufacturing a stator core for an axial air-gap electronic motor in which a stator and a rotor are arranged opposedly along the axis line direction of a rotor output shaft, said stator comprising a plurality of pole members (21a-21i) disposed about a rotation axis of the rotor output shaft, each of said pole members (21a-21i) including a stator core for forming the axial air-gap electronic motor, said stator core, consisting of a laminated body formed by laminating a plurality of core sheets (23a-23t) which are blanked from a metallic sheet in a radial direction of the stator to form a trapezoidal shape of the stator core in which the width of the stator core in a circumferential direction about the stator increases from a center of the rotor output shaft toward the outside, characterised by the method comprising: forming, with first punches, a first slot surface on one side in the circumferential direction of each of the core sheets (23a-23t); forming, with a second punch, a second slot surface on an other side of the said one side in the circumferential direction of each of the core sheets (23a-23t); reciprocatingly moving, with a first moving means, the first punches; reciprocatingly moving, with a second moving means, the second punch, wherein the first punches are provided in a pair with a predetermined clearance being provided therebetween, and the second punch is arranged between the pair, wherein the method further comprises: a first blanking step in which the first slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the first punches; and a second blanking step in which the second slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the second punch at predetermined intervals. forming, with first punches, a first slot surface on one side in the circumferential direction of each of the core sheets (23a-23t); forming, with a second punch, a second slot surface on an other side of the said one side in the circumferential direction of each of the core sheets (23a-23t); reciprocatingly moving, with a first moving means, the first punches; reciprocatingly moving, with a second moving means, the second punch, wherein the first punches are provided in a pair with a predetermined clearance being provided therebetween, and the second punch is arranged between the pair, wherein the method further comprises: a first blanking step in which the first slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the first punches; and a second blanking step in which the second slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the second punch at predetermined intervals. a first blanking step in which the first slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the first punches; and a second blanking step in which the second slot surfaces of the first to nth (n is a positive integer) core sheets are blanked in succession out of the metallic sheet by moving the second punch at predetermined intervals.