To provide an input-output terminal batch connecting device by which a connecting work can be smoothly conducted by a simple structure when the number of input-output terminals is increased like an audio system, and a removing work of connecting pins can be conducted with ease in a short period of time.

The input-output terminal batch connecting device comprises a pin board 13 in which a great number of through-holes 21, through which a great number of connecting pins are respectively passed through, are made, holding means composed of O-rings 22 and 23 provided between each connecting pin 14 and an internal wall of the through-hole and conducting centering of the connecting pins 14 to hold them when the connecting pins 14 are passed through the through-holes 21 to be arranged, and adjusting means for adjusting a movement of each connecting pin in an axial direction of the connecting pin and composed of a sleeve 25, washers 26, 27 and a projection 24.