PROBLEM TO BE SOLVED: To provide a syringe assisting tool with improved versatility, capable of easily removing needle caps of various shapes.SOLUTION: A syringe assisting tool 1 for removing a needle cap 54 that covers a syringe needle 53 fixed to a syringe 50 comprises: a syringe housing member 5 on which the syringe 50 with the needle cap 54 mounted thereon is disposed and which fixes a position of the syringe 50 in an axial direction along a center axis of the syringe needle 53 a needle cap holding member 6 which holds the needle cap 54 from sides in the axial direction an interlock mechanism 10 which switches between a holding state in which the needle cap 54 is held by the needle cap holding member 6 and a holding release state in which the holding state is released, and which moves the needle cap holding member 6 along the axial direction in the holding state and operation members 4L, 4R which operates movement of the interlock mechanism 10.COPYRIGHT: (C)2016,JPO&INPIT【課題】注射器補助治具において種々の形状の針キャップを容易に取り外すことができ汎用性を向上することができるようにする。【解決手段】注射器50に固定された注射針53にかぶせられた針キャップ54を抜去する注射器補助治具1であって、針キャップ54が装着された注射器50を配置して、注射針53の中心軸線に沿う軸線方向における注射器50の位置を固定する注射器収容部材5と、針キャップ54を軸線方向に対する側方から保持する針キャップ保持部材6と、針キャップ保持部材6が針キャップ54を保持する保持状態とこの保持状態を解除される保持解除状態とを切り替えるとともに、保持状態において針キャップ保持部材6を軸線方向に沿って移動させる連動機構10と、連動機構10の動作を操作する操作部材4L、4Rと、を備える構成とする。【選択図】図1