To easily lead out a lead-out line from each of ends of a primary winding or a secondary winding while intending miniaturization without reducing output characteristics and magnetic performance.

A primary winding 24 is wound on a first leg part 61 constituting a core 51, and individual secondary windings 36 are wound on a second leg part 62 separate from the first leg part 61, respectively. For this reason, the primary winding 24 and the secondary winding 36 are not together wound on a common leg part, and it is possible to easily lead out from each of both ends of the primary winding 24 and the secondary winding 36. Further, the secondary winding 36 can be uniformly wound without being interrupted by the other secondary winding 36 or the primary winding 24, and a transformer 12 is miniaturized to obtain the stable output characteristic simultaneously.