REACTOR

PROBLEM TO BE SOLVED: To provide a reactor having improved productivity. SOLUTION: The reactor 1 includes: an annular magnetic core 11; a coil forming body 12A disposed at an outer periphery of the magnetic core 11; and an outer resin section 13 for covering an outer periphery of an assembly 10 of the magnetic core 11 and the coil forming body 12A. The magnetic core 2 is formed annularly by combining a plurality of core pieces, and is covered with the outer resin section 13 and hence is fixed annularly without going through an adhesive. The coil forming body 12A includes: a coil 12 where winding 12w is wound spirally; and an inner resin section 12c for holding the coil 12 in a compressed state. Since no adhesives are utilized for forming the magnetic core 11, no joining processes are required. By utilizing the coil forming body 12A, it is not necessary to form the reactor 1 while compressing the coil 12, thus improving productivity of the reactor 1. COPYRIGHT: (C)2011,JPO&INPIT