REACTOR, CORE PART FOR REACTOR, CONVERTER AND POWER CONVERSION DEVICE

A reactor 1 according to the present invention includes a coil 2 and a magnetic core 3 where the coil 2 is disposed. In the reactor 1, a core part 4A (4B) including a stacked columnar body having a plurality of core pieces 31m and a plurality of gap members 31g stacked and coating resin 5A (5B) in which a peripheral surface coating portion 51oA (51oB) for coating an outer peripheral surface of the stacked columnar body to integrally hold the core piece 31m and the gap member 31g and an end surface coating portion 51eA for coating one end surface of the stacked columnar body are molded integrally is used for a part of the magnetic core 3, that is, an inner core 31. A manufacturing error of the core piece 31m or the gap member 31g is absorbed by the end surface coating portion 51eA. Consequently, the core part 4A (4B) can be molded with high accuracy and an outer core 32 can be assembled properly. Thus, the reactor 1 has high assembling workability.