PURPOSE: To dispense with extreme projection of the outside end part of an I-arm and the outside end part of a trailing link into a wheel improve layout property by connecting the outside end part of the I-arm and the outside support so as to end part of the trailing link to the wheel support through a double pivot.

CONSTITUTION: A lower arm is composed of an I-arm 50 and a trailing link 60, and the outside end part of the I-arm and the outside end part of the trailing link are connected to the different part positions mutually being close to each other of the lower part of a wheel support respectively through ball joints so as to form a double pivot. A king pin shaft is set through the instantaneous center of the double pivot as the point of intersection of the axis connecting together both end of the I-arm and the axis connecting together both end of the trailing link, and inclination of the king pin shaft at viewing from the front face becomes large. Therefore, it is unnecessary to extremely project the outside end part of the I-arm 50 and the outside end part of the trailing link 60 into the wheel support.