An object of the present invention is to provide a medical device in which tubes adjacent to each other in the axial direction are firmly connected to suppress breakage and improve safety. An elongated medical device (10) to be inserted into a living body, comprising a distal tube (31) and a proximal tube (32) adjacent in the axial direction, and a distal tube (31) and a proximal tube (31). A joining member 50 that joins the side tubes 32, wherein the joining member 50 extends over the distal tube 31 and the proximal tube 32, and the joining member 50 is connected to the distal tube 31. The joining member 50 has a first through-hole 55 and a second through-hole 56 penetrating from the inner side surface 51 to the outer side surface 52, and abuts on both outer peripheral surfaces of the proximal side tube 32 and the proximal side tube 32. Part of the side tube 32 enters the first through hole 55 and the second through hole 56. [Selection] Figure 2【課題】軸方向に隣接する管体を強固に連結して破損を抑制し、安全性が向上する医療用デバイスを提供する。【解決手段】生体内に挿入される長尺な医療用デバイス１０であって、軸方向に隣接する遠位側管体３１および近位側管体３２と、遠位側管体３１および近位側管体３２を接合する接合部材５０と、を有し、接合部材５０は、遠位側管体３１および近位側管体３２にわたって延在し、接合部材５０は、遠位側管体３１および近位側管体３２の両方の外周面に当接し、接合部材５０は、内側面５１から外側面５２へ貫通する第１の貫通孔５５および第２の貫通孔５６を有し、近位側管体３２の一部が、第１の貫通孔５５および第２の貫通孔５６に入り込んでいる。【選択図】図２
