PURPOSE: To improve tensile strength of an anode lead wire by positioning a printed substrate in an insulating case and fixing it to the case to sandwich the anode lead wire using the printed substrate and the insulating case.

CONSTITUTION: A flyback transformer comprises a main body therof of which bobbin 3 is wound by a coil, a printed substrate 5, an anode lead wire 6 of which one end is connected to the printed substrate 5, an insulating case 2 and a shield case 1. Coupling parts 2 and 2' with which the substrate 5 provided with a protrusion 5' is coupled are provided on the case 2. The lead wire 6 is sandwiched by the substrate 5, the bobbin 3 and the case 2.