To provide the supplementary tool of an interline telescopic split-mounted fishing rod, that can be attached to a commercially available telescopic split-mounted fishing rod to give the interline telescopic split-mounted fishing rod which can simply be utilized as the interline telescopic split-mounted fishing rod and in which a fishing line can readily be inserted into an ear rod and further give the interline telescopic split-mounted fishing rod capable of being safely used for fishing Plecoglossus altivelis with a decoy.

This supplementary tool of the interline telescopic split-mounted fishing rod, which is detachably attached to the bottom side f the butt section side outer cylinder of the interline telescopic split-mounted fishing rod, characterized in that the fishing rod is manufactured by forming a stored cylinder group-receiving surface on the attaching tip side of the supplementary tool, forming the supporting surface in a funnel-like dent surface shape conical in the central direction, and forming on the bottom side of the dent surface a fishing line guide hole which has a smaller diameter than the inner diameter of the ear cylinder and through which the fishing line inserted from a fishing line insertion hole disposed at a site of the circumferential surface of the supplementary tool by the use of an fishing line insertion tool can directly be guided into the ear cylinder.