PROBLEM TO BE SOLVED: To provide a supporting method for a tree which can ensure a root pot is secured and which can appropriately prevent tilting of the root pot against the vertical when ground subsidence occurs or when a tilting force acts thereon compared to the prior art, and a fixing tool for the root pot used in the supporting method for a tree.SOLUTION: A supporting method for a tree in which the tree is supported by contacting a contact body for a root pot with a root pot for the tree and fixing the root pot by pressing the root pot with the contact body for the root pot, is characterized by engaging a contact member fixing member for the root pot to the root pot to hold the contact body for the root pot from the outside in a state where the contact body for the root pot is in contact with the root pot and fixing the root pot to the contact body for the root pot by the contact member fixing member for the root pot.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2017,JPO&INPIT【課題】従来の技術に比べて、根鉢をより確実に固定することができ、地盤沈下が生じた場合や樹木に傾倒力が作用する場合における、鉛直方向に対する根鉢の傾きをより好適に防止することができる樹木の支持施工方法と、その支持施工方法に用いる根鉢用固定用具を提供することを課題とする。 【解決手段】樹木の根鉢に根鉢用接触体を接触させ、該根鉢用接触体で根鉢を押圧して該根鉢を固定することにより樹木を支持施工する樹木の支持施工方法において、前記根鉢に根鉢用接触体を接触させた状態で該根鉢用接触体を外側から保持するための根鉢用接触体固定部材を前記根鉢に食い込ませ、該根鉢用接触体固定部材で前記根鉢用接触体を根鉢に固定することを特徴とする。【選択図】図8