To facilitate manufacture by directly forming side parts of projection electrode parts as only a wall and to enable a cylindrical bobbin wound with a coil to be inserted.

The machining of a stator iron coil and a resolver is facilitated by forming respective projection electrode parts (3) and respective side parts (3a) of a ringlike stator (1) of only the straight-line wall (3A) and the manufacture of the resolver is facilitated by inserting the cylindrical bobbin (2) having been wound with the coil.