Insulated bobbin for stator

Disclosed is an insulated bobbin for stator which has good insertability of a stator iron core with no reduction of coil winding space. A first bobbin and a second bobbin each comprise a bobbin inner rim wall, provided along an outer rim face of an iron core main body, and a projections projecting from the bobbin inner rim wall in the diameter direction in correspondence with a plurality of projecting poles, each projection being U-shaped in cross-section with an opening on the division side, and a pair of side walls of the projections being of different height in the central axial direction so that a step is created by their edges.