An auxiliary device is used for assisting electrical connection between pins of an electronic component and corresponding contact portions of a printed circuit board. The auxiliary device includes a main body and a plurality of connection parts. The main body has a plurality of perforations for the pins to penetrate therethrough. The connection parts are coupled to the main body and penetrate through corresponding retaining holes of the printed circuit board such that the main body is fixed on the printed circuit board. The pins of the electronic component penetrate through corresponding perforations of the main body and are in contact with corresponding contact portions of the printed circuit board.