A stator (50A, 50B, 50C, 50D) having a central axis, the stator comprising: a core having a cylindrical portion and a plurality of teeth radially and inwardly extending toward the central axis; an insulator (20A, 20B) placed on an axial end surface of the core; a plurality of coil windings, the coil windings each wound around one of the teeth; lead wires extending from both ends of each of the coil windings; and a yarn securing the lead wires on to the insulator, the insulator having: an outer wall surrounding the central axis and erected in such a way as to axially extend away from the axial end surface; a plurality of teeth cover portions extending radially and inwardly from the outer wall toward the central axis; and a plurality of inner walls, the inner walls each being erected at and extending axially from a distal end portion of each of the teeth cover portions, the coil windings being placed on the corresponding teeth cover portions and between the outer wall and the corresponding inner walls, at least one passage portion being formed in the outer wall, the passage portion being configured to pass the yarn therethrough, and characterized in that the insulator further has at least one projection portion, the at least one projection portion spacing the lead wires from the coil windings and securing the lead wires, the at least one projection portion radially and inwardly extending from the outer wall, and the lead wires rest on the at least one projection portion, and being tied with the yarn passing through the passage portion to be restrained. a core having a cylindrical portion and a plurality of teeth radially and inwardly extending toward the central axis; an insulator (20A, 20B) placed on an axial end surface of the core; a plurality of coil windings, the coil windings each wound around one of the teeth; lead wires extending from both ends of each of the coil windings; and a yarn securing the lead wires on to the insulator, the insulator having: an outer wall surrounding the central axis and erected in such a way as to axially extend away from the axial end surface; a plurality of teeth cover portions extending radially and inwardly from the outer wall toward the central axis; and a plurality of inner walls, the inner walls each being erected at and extending axially from a distal end portion of each of the teeth cover portions, an outer wall surrounding the central axis and erected in such a way as to axially extend away from the axial end surface; a plurality of teeth cover portions extending radially and inwardly from the outer wall toward the central axis; and a plurality of inner walls, the inner walls each being erected at and extending axially from a distal end portion of each of the teeth cover portions, the coil windings being placed on the corresponding teeth cover portions and between the outer wall and the corresponding inner walls, at least one passage portion being formed in the outer wall, the passage portion being configured to pass the yarn therethrough, and characterized in that the insulator further has at least one projection portion, the at least one projection portion spacing the lead wires from the coil windings and securing the lead wires, the at least one projection portion radially and inwardly extending from the outer wall, and the lead wires rest on the at least one projection portion, and being tied with the yarn passing through the passage portion to be restrained.