The medical device (1A) includes a cylindrical guide member (2), a linear member (3) inserted through the guide member (2), and a connecting member (4) provided on the distal end side of the guide member (2). 1st through-hole (41E) which has a 1st opening (411) through which a part of linear member (3) penetrates, and the front end side of linear member (3) protrudes, and linear member (3) ) Of the distal end side of the linear member (3) in accordance with the movement of the linear member (3) to the proximal end side. A connecting member (4) having a clamping part (41F) that can be switched from a supporting state in which the end part is supported to a detached state in which the end part on the distal end side of the linear member (3) is detached, and the linear member； The indwelling member (9) having an annular portion (93) through which the protruding portion (3A) protruding from the first opening (411) of (3) is inserted is provided. The indwelling member (9) is connected to the connecting member (4) in a supported state and detached from the connecting member (4) in a detached state.医療装置（１Ａ）は、筒状の誘導部材（２）、誘導部材（２）の内部に挿通される線状部材（３）、誘導部材（２）の先端側に設けられた連結部材（４）であって、線状部材（３）の一部が挿通し且つ線状部材（３）の先端側が突出する第１開口（４１１）を有する第１貫通孔（４１Ｅ）、線状部材（３）の先端側の端部を脱離可能に支持する挟持部（４１Ｆ）であって、線状部材（３）が基端側に移動することに応じ、線状部材（３）の先端側の端部を支持した支持状態から、線状部材（３）の先端側の端部が脱離した脱離状態に切り換え可能な挟持部（４１Ｆ）を有する連結部材（４）、及び、線状部材（３）のうち第１開口（４１１）から突出する突出部（３Ａ）が挿通される環状部（９３）を有する留置部材（９）を備える。留置部材（９）は、支持状態で連結部材（４）に連結し、脱離状態で連結部材（４）から脱離する。
