Abstract: A rod holder is provided with a holder main body having a rectangular holding portion therein, and an opening disposed at one side of the holder main body. The opening is enlarged when a rod member is inserted into the opening, and the opening is returned to an original condition when the rod member is held inside the rod holding portion. A window is provided at a side wall of the holder main body, and a rod receiving piece is formed in the window to project inside the holding portion. When a square rod member is held in the rod holding portion, the rod receiving piece can be elastically deformed by an outward pressing force of the rod member to be located inside the side wall. When a round rod member is held by the rod holder, the rod receiving piece engages a lower surface of the round rod member to hold the same. Thus, the rod holder of the invention can be used for holding both the square rod member and the round rod member.