The present invention provides a coil end structure of a rotating electric machine which is able to miniaturize the coil end structure without having an insulation coating of a flat wire being affected. A coil segment 4 is composed of a plurality of flat wires. A surface of each flat wire confronting another in a slot 2a (legs 41 and 41) is identical to the surface confronting the other at a coil end (head 42).