To provide a stator of a rotary electric machine which decreases an eddy current loss while maintaining processability of a winding and improving a space factor of a coil winding within a slot.

A stator 10 of a rotary electric machine comprises: a plurality of slots 18 which are arranged in a circumferential direction of a stator core 12; and a coil body 20 which is formed by winding a coil 22 and the like consisting of one conductor disposed in the circumferential direction of a slot 18 in the radial direction of the slot 18 multiple turns. The coil body 20 includes: a square conductor part 40 in the slot 18; a magnetic material layer 42 arranged around the square conductor part 40; and an insulation coat 44 arranged around the magnetic material layer 42. The coil body 20 includes coils 22, 24, 26, and 28 including the square conductor part 40 and the insulation coat 44 arranged around the square conductor part 40, at coil ends 30 and 32 protruding into both endpoints of the slot 18.