An extension rod for laver cultivation is provided to facilitate that a rope for fixing is quickly inserted to the extension rod for laver cultivation. An extension rod for laver cultivation in which a through-hole(29) for fixing is opened in the circumference of both ends side of a hollow pipe comprises the following features. The through-hole is installed in the opposite side of the outer circumference of the hollow pipe within the opened body part. The hollow pipe includes the resin-made joint in which one end is set up in both end part of a supporting pipe and the supporting pipe(25). The hollow pipe the body part is formed within the joint body(27).
