PURPOSE: To eliminate mutual interference of signals between contact pins for signals which are in close proximities to one another, in a base of a connector.

CONSTITUTION: A signal wire 3 and an earth wire 4 alternately arranged on a ribbon-shape connection electric wire 1 in the width direction, are connected together by a connector, and a contact piece 6 for signal and connection pieces 10, 11 for earth are embedded in a base 5, while a signal contact pin part 6b and earth contact pin parts 10b, 11b are alternately arranged in X and Y axial directions, and the signal contact pin parts that are in close proximities to one another are arranged in a diagonal mode, to extend the distance.