Predetermined length, the proximal region 42 having a substantially circular shape and having an outer diameter, and extends from the distal end of the proximal end region, a distal region 41 having a smaller outer diameter than the proximal end area, the base Because disposed in the end region, the proximal end of the tip region, and with an opening at the distal end, and performs a predetermined medical action, and the lumen 44 of the first for inserting the operation medical member, at least, guiding elongated medical member which includes hole 47a of the first one, and (47b) at least communicating with the lumen of the first, is disposed on the side peripheral portion of the proximal region.所定の長さ、及び外径を有する断面略円形状の基端領域42と、該基端領域の先端から延設し、該基端領域よりも小さな外径を有する先端領域41と、上記基端領域内に配設され、上記先端領域の近位端、及び遠位端で開口すると共に、所定の医療行為を行うため、少なくとも作業用医療部材を挿通するための第1のルーメン44と、該第1のルーメンと連通し、上記基端領域の側周部に配設される少なくとも1つの第1の孔部47a(47b)と、を具備するガイド用細長医療部材。
