PROBLEM TO BE SOLVED: To provide a small-sized step-up transformer capable of easily carrying out coil terminal processing to a winding terminal, and improving the efficiency of work.;SOLUTION: A small-sized step-up transformer is composed of a pedestal 11 provided with a plurality of winding terminals 21; a ring core 12 which has a top wall 25 and a side wall 26 integrally constituted with the top wall, has a circular fitting hole 28 on the top wall 25, and is placed on the pedestal 11; a drum core 13 fitted with the fitting hole 28 of the ring core 12; and a coil 23 wound around a magnetic core portion 13a. The winding terminal 21 has a tapered portion 21c which is narrow at a base end portion 21a around which the coil 23 is wound, and increases width toward a tip end portion 21b, and a coil terminal processing groove 24 having an edge 24a for peeling the coating of the coil 23 is formed on the tapered portion 21c.;COPYRIGHT: (C)2012,JPO&INPIT
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