An attachment tube for a top guide has a central axis extending in a longitudinal direction, a first insertion opening provided at one end in the longitudinal direction, a rectangular second insertion opening provided at the opposite end in the longitudinal direction, and an inclined surface provided at the opposite end. A tip portion of a fishing rod is inserted to the first insertion opening. An insertion leg of a frame supporting a guide ring is inserted to the second insertion opening. A rectangle center of the second insertion opening is spaced upward apart from the central axis. The inclined surface adjoins the second insertion opening and is inclined at an acute angle with respect to the central axis.本發明提供一種頂部導件用安裝管。實施例之頂部導件用安裝管具有:中心軸,其沿長邊方向延伸;第1插入口,其設置於長邊方向上之一端;長方形之第2插入口,其設置於長邊方向上之另一端;及斜面,其設置於另一端。釣竿之前端部插入至第1插入口。支持導向環之框架之插入腳插入至第2插入口。第2插入口之長方形之中心自中心軸向上方離隔。斜面與第2插入口相接並相對於中心軸呈銳角傾斜。13‧‧‧釣竿之前端部20A1‧‧‧頂部導件100A1‧‧‧安裝管110A1‧‧‧管體111‧‧‧安裝管之一端112‧‧‧安裝管之另一端120‧‧‧第1插入口140‧‧‧斜面200A‧‧‧框架210‧‧‧環保持部220A‧‧‧插入腳230R‧‧‧右支腳300‧‧‧導向環
