To provide a plate conductor coil of an armature lamination core which can be attached to the magnetic portion of the armature lamination core without the need for assembling, dispenses with conventional connection of a plate conductor piece and a plate conductor connection piece and causes no positional deviation, and to provide its manufacturing method.

The plate conductor coil 10 with a plate conductor 11 spirally wound around the magnetic portion of the armature lamination core is alternately and repeatedly provided with slits 12, 13 at a prescribed pitch in parallel wherein their end portions 16, 17 reach, from one end 14 and from the other end 15 in the width direction of the conductor plate, each front position of the plate end on the other side. Each conductor portion 18 formed by the slits 12, 13 forms a continuous plate conductor 11, and the adjacent conductor portions 18 are subjected to projected fold and recessed fold, using lines A, B connecting the end portions 16, 17 of the slits 12, 13 as a folding line, to form an entirely spiral plate conductor coil 10.