PROBLEM TO BE SOLVED: To provide a medical longitudinal member which has an excellent operability in a pulmonary airway and prevents formation of a level difference in a connection part at which a plurality of members different in a lumen diameter, an outer diameter thereof, and a physical property thereof are connected, so that various members, liquid and so forth can be smoothly moved in the lumen, and a connection member used for the medical longitudinal member.SOLUTION: A longitudinal member 10 comprises: a bend part 20 which is arranged at the tip side； a body part 50 which is arranged at the base end side of the bend part； and an entry auxiliary part 40 connecting the bend part with the body part, which includes a tip end insertion hole 41 into which the base end part of the bend part is insertable, a base end insertion hole 42 into which the tip part of the body part is insertable, and a lumen 43 which is connected with the tip end insertion hole and the base end insertion hole and of which diameter is gradually reduced from the diameter of the lumen 53 in the body part to the diameter of lumen 23 in the bend part between the base end side and the tip side.【課題】肺気道内での操作性に優れ、かつ、内腔の径、外径、および物性が異なる複数の部材が接続された接続部分に段差が形成されることを防止し、もって内腔における各種の部材および流体等の円滑な移動を可能にした医療用の長尺部材、および当該医療用の長尺部材に用いられる接続部材を提供する。【解決手段】長尺部材１０は、先端側に配置された湾曲部２０と、湾曲部の基端側に配置された本体部５０と、湾曲部の基端部が挿入可能な先端挿入孔４１、本体部の先端部が挿入可能な基端挿入孔４２、および先端挿入孔と基端挿入孔に連なり基端側から先端側にかけて本体部の内腔５３の径から湾曲部の内腔２３の径まで径が漸減する内腔４３を備え、湾曲部と本体部を接続する進入補助部４０と、を有している。【選択図】図２
