A chain is provided, whose strength is increased and whose power loss is reduced as a result of reduced friction resistance between link units and link plates. A pair of link plates 160 are pivotally coupled to a link unit 101 in the chain 100. A pair of connecting pin portions 110 and a pair of plate portions 140 are inseparably joined at joint parts 150 to form one link unit 101. A stopper portion 123 is provided to the connecting pin portion 110 between a plate portion 140 and a link plate 160 adjacent each other in the width direction to restrict the link plate 160 from coming closer to the plate portion 140.