REACTOR

PROBLEM TO BE SOLVED: To provide an inexpensive reactor which has a small amount of electromagnetic waves emitted outside an apparatus and is compact and lightweight.SOLUTION: An E-type iron core 1 and an I-type iron core 2 formed by laminating silicon steel sheets are disposed in a state of being abutted on each other, insulation paper 4 is arranged around a central magnetic leg 1a of the E-type iron core 1 to wind a coil 3, and an air gap 6 is formed between the central magnetic leg 1a of the E-type iron core 1 and the I-type iron core 2. A rectangle molded iron core 5 containing powder ferromagnetic materials is equipped in the air gap 6 in a state of being protruded from the end surface of the central magnetic leg 1a of the E-type iron core 1.