PROBLEM TO BE SOLVED: To provide connecting members which hardly transform.SOLUTION: A connecting member 1 is a connecting member for connecting a pair of arch members used in a vinyl house, comprising a pair of insertion portions 101, 101 which are provided in both ends and in which an opening capable of inserting each arch member is formed, and a trunk portion 104 which is provided so as to connect the insertion portions and which is thicker than the insertion portions. Preferably, the trunk portion comprises a tubular relay portion 102 formed to unify with the insertion portions, and a reinforcing member 201 which is arranged inside of the relay portion and is shorter than the total length of the insertion portion and the relay portion.SELECTED DRAWING: Figure 2【課題】変形しにくい連結部材を提供する。【解決手段】連結部材1は、ビニールハウスに用いられる一対のアーチ部材を連結する連結部材であって、両端部に設けられ、アーチ部材のそれぞれを挿入可能な開口が形成された一対の挿入部101,101と、挿入部を繋ぐように設けられ、挿入部よりも肉厚の厚い胴部104と、を備える。胴部は、挿入部と一体的に形成される管状の中継部102と、中継部の内部に配置され、挿入部及び中継部を合わせた長さよりも短い補強部材201と、を備えることが好ましい。【選択図】図2