A coil part, comprising: - a no-cut magnetic core of a closed magnetic path; - a coil formed by a wire; - an annular case which houses the no-cut magnetic core; - a bobbin comprising: a cylindrical portion around which the wire of the coil is wound, inner flanges provided at opposite ends of the cylindrical portion, wherein the coil is provided between the inner flanges, outer flanges provided at opposite ends of the cylindrical portion on an outer side of the inner flanges with respect to a center position of the cylindrical portion in an axial direction and with a space being left between the outer flanges and the inner flanges containing a wire end portion, and a gear portion provided on an outer side of at least one of the outer flanges for receiving rotational force, the bobbin being rotatably supported on a linear portion of the annular case at the cylindrical portion, an outside diameter of the outer flanges is greater than an outside diameter of an addendum circle of the gear portion, and the inner flanges and the outer flanges have a recessed portion (15, 16)where the wire end portions of the coil are passing. - a no-cut magnetic core of a closed magnetic path; - a coil formed by a wire; - an annular case which houses the no-cut magnetic core; - a bobbin comprising: a cylindrical portion around which the wire of the coil is wound, inner flanges provided at opposite ends of the cylindrical portion, wherein the coil is provided between the inner flanges, outer flanges provided at opposite ends of the cylindrical portion on an outer side of the inner flanges with respect to a center position of the cylindrical portion in an axial direction and with a space being left between the outer flanges and the inner flanges containing a wire end portion, and a gear portion provided on an outer side of at least one of the outer flanges for receiving rotational force, the bobbin being rotatably supported on a linear portion of the annular case at the cylindrical portion, an outside diameter of the outer flanges is greater than an outside diameter of an addendum circle of the gear portion, and the inner flanges and the outer flanges have a recessed portion (15, 16)where the wire end portions of the coil are passing. a cylindrical portion around which the wire of the coil is wound, inner flanges provided at opposite ends of the cylindrical portion, wherein the coil is provided between the inner flanges, outer flanges provided at opposite ends of the cylindrical portion on an outer side of the inner flanges with respect to a center position of the cylindrical portion in an axial direction and with a space being left between the outer flanges and the inner flanges containing a wire end portion, and a gear portion provided on an outer side of at least one of the outer flanges for receiving rotational force, the bobbin being rotatably supported on a linear portion of the annular case at the cylindrical portion, an outside diameter of the outer flanges is greater than an outside diameter of an addendum circle of the gear portion, and the inner flanges and the outer flanges have a recessed portion (15, 16)where the wire end portions of the coil are passing.