The object of the invention is to improve operability of the process for inserting the coil conductor into the insulating member stored inside the slot of the rotor core. Each of the first insulating member and the second insulating member has one side arranged between the first coil and the second coil so that the respective sides are superposed along the radial direction of the stator core. The side of the first insulating member and the side of the second insulating member are connected with the first connection part at one end in the longitudinal direction.