Conveyor chain

A conveyor chain comprising:

• a large number of chain links into which an article loading part to be loaded with articles and a plurality of hinge portions protruding in a staggered manner from a front end edge and a rear end edge in a longitudinal direction of the chain are integrally molded;
• hinge pins connecting the hinge portions of the chain links;
• and
• a plurality of free rollers protruding through both front and rear surfaces of the chain links,
• wherein the plurality of free rollers are rotationally held in roller holders one by one to constitute a roller unit,
• the chain links have a unit mounting region providing for the roller unit to be mounted from the longitudinal direction of the chain,
• the roller holder has a cylindrical circumscribing surface,
• the unit mounting region has a contact surface in contact with the circumscribing surface of the roller holder in a semicircle, and
• the circumscribing surface of the roller holder and the contact surface of the unit mounting region are prevented from rotating by an engagement apparatus comprised of a protruding portion provided on one of the surfaces and a recess portion provided on the other.