Abstract: A chain (CA) comprises a plurality of link units (10), each including a pair of link plates (11) and a connection member (12) placed between the link plates (11) at one end of each link unit (10). The link plates (11) of one link unit (10) are connected end to end with the link plates (11) of another link unit (10) by a connecting pin (13) in such a way that the link units (10) are angularly displaced by 90 degrees from one link unit (10) to another as viewed along an extending direction of the chain (CA), whereby the successive link units (10) of the chain (CA) can be alternately bent in two different directions. The chain (CA) thus constructed can be bent and run in desired directions.