An inverter transformer includes a core structure, bobbins each including a spool portion and first and second terminal blocks and having a part of the core structure inserted therein, and primary and secondary windings wound around the bobbin, wherein the first and second terminal blocks have recesses formed at their end faces and adapted to lodge terminal pins to tie wire ends of the secondary winding therearound, the distal tip ends of the terminal pins lodged in the recesses of the first and second terminal blocks are positioned either flush with or inward of the end face of the first and second terminal blocks, parts of the core structure are located above the recesses, and the end faces of the core structure oriented substantially orthogonal to an extending direction of the terminal pins are positioned either flush with or outward of the distal tip ends of the terminal pins.