A BALUN trans and feeder line connecting device for the antenna matching adapter, which is connected to an F-connector for VHF mounted on the antenna terminal strip of a television set is disclosed. According to the invention, each outgoing line of the BALUN trans is connected to each corresponding connecting terminal of the shield side spring and hot side pin provided in the adapter body and to the connecting terminal of feeder line connecting piece, and the annealed copper stranded wire of the antenna feeder line is connected to the other end of the feeder line connecting piece, wherein a cut-off connecting groove in which the end of feeder line is fitted, is formed at the front end of each connecting terminal, and a pointed connecting portion consisting of both connecting blades and the intermediate groove is formed on the other side of the said feeder line connecting piece; a cover coupled with the adapter body is divided into two cover plates: one for the plug terminal connecting portion and the other for the feeder line connecting portion, which are to be opened and shut separately, and a pressing portion and a pressing piece are formed in a predetermined position inside of each cover plate. Coupling and connecting between each outgoing line and connecting terminal and between each feeder line and connecting piece is realized only closing the cover.