| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor suppressed in stress due to thermal expansion at an inside of a composite magnetic body.SOLUTION: A reactor comprises: a coil 2 formed by winding a conductor; and a composite magnetic body 1 containing soft magnetic powder, a binder and hollow particles 11. The coil 2 is buried in the composite magnetic body 1, and each of the hollow particle 11 has a D50 of less than 10 μm. The D50 is a volume-based cumulative 50% particle diameter. Preferably, the D50 of each of the hollow particles is 0.1 μm or more and 5.0 μm or less, and an average of a ratio between the inner diameter and the outer diameter in each of the hollow particles is 0.30 or more and 0.99 or less. |
