PROBLEM TO BE SOLVED: To provide an indwelling position adjuster capable of cleanly adjusting a position of a linear member in the body even after retention.SOLUTION: An indwelling position adjuster includes: a cylindrical body 41 a cover 42 that is attached to a base end of the body and in which an internal space 42b and an opening 42a, communicating with a cylinder hole 41a of the body, are formed a fixing part 43 that is provided in the opening and that can fix the linear member 10, inserted through the opening, to the opening in a watertightly-sealed state and an adjusting mechanism 44 that is provided in the cover and that can adjust a distance between a tip part of the cover and the opening.COPYRIGHT: (C)2014,JPO&INPIT【課題】留置した後でも体内における線状部材の位置の調整を清潔に行うことができる留置位置調整具を提供する。【解決手段】留置位置調整具は、筒状の本体41と、本体の基端部に取付けられ、本体の筒孔41aに連通する内部空間42bおよび開口42aが形成されたカバー42と、開口に設けられ、開口に挿通された線状部材10を開口に対して水密に封止した状態で固定可能な固定部43と、カバーに設けられカバーの先端部と開口との距離を調節可能な調節機構44とを備える。【選択図】図1