A ground terminal mountable to a peripheral portion of a printed board, which includes a ground terminal body having a pick-up portion picked up by a mounter and a first end edge portion formed with a semicircular notch, and which includes a connection portion formed in, for example, a second end edge portion of the ground terminal body. To mount the ground terminal to a printed board having a first side edge portion formed with a mounting hole having a function of a positioning hole, the printed board is positioned at a part mounting position with its first and second side edge portions individually engaged with first and second guide rails, and the mounter is operated to place the ground terminal on the printed board, with the notch directed to the first guide rail and aligned with the mounting hole.