A cable clamp includes a single metal plate shaped along an outer periphery of three cables that are triangularly arranged when viewed in cross-section, a mounting flange portion formed with both end portions of the metal plate overlapped each other, and a cable support member inserted between at least two of the three cables so as to support the at least two cables between itself and the metal plate. The cable support member is inserted between two horizontally arranged cables in a direction perpendicular to the horizontal direction as well as perpendicular to a longitudinal direction of the two horizontally arranged cables. The cable support member has a tapered shape on an end side in an insertion direction thereof for facilitating an insertion thereof into a gap between the two horizontally arranged cables.