< Topic >In Tugiki job, the cutting aspect of the stock and the scion being dented more loosely than plane surface, the Tugiki knife which it can cut is offered.SolutionsRegarding to the cutting aspect of the stock and the scion with being dented more loosely than plane surface, cutting the cutting aspect of the stock and the scion vis-a-vis the cutting direction of the blade, making use of the Tugiki knife which possesses the blade 42 which in the upper part or the lower part buckles in concave condition, it tried not to have the fact that the cignin contacts.< Choice figure >Drawing 4【課題】接木作業において、台木や穂木の切削面が平面よりもゆるく凹んで切削できる接木ナイフを提供する。【解決手段】刃の切削方向に対して、上方又は下方に凹状に湾曲する刃体42を有する接木ナイフを用いて、台木と穂木の切削面を平面よりもゆるく凹んで切削する事により台木と穂木の切削面に於いて、木質部同士が接触することがない様にした。【選択図】図4