The present invention provides a medical instrument including a resin tube which has excellent pushability in a complicatedly bent body cavity or an extra fine body cavity such as a terminal region of a blood vessel, and high selectivity at branched body cavity, and the present invention provides a medical instrument comprising a medical instrument body which is inserted into a body cavity, wherein the medical instrument body comprises a long resin tube the long resin tube has a first region having a distal end and a second region having a proximal end the first region is more flexible than the second region.本發明係提供一種於複雜曲折之體腔、或血管末梢區域等之極細體腔內,維持良好之可推進性,且包含分支選擇性良好之樹脂管之醫療機器。本發明之醫療機器係包含插入體腔內之醫療機器本體者,且,上述醫療機器本體包含長條之樹脂管,上述樹脂管具備:包含遠位端部之第一區域、及包含近位端部之第二區域,上述第一區域較上述第二區域更柔軟。10‧‧‧外管(樹脂管)12‧‧‧第一區域14‧‧‧第二區域14a~14e‧‧‧樹脂構件30‧‧‧標記物50‧‧‧握持部60‧‧‧外層100‧‧‧導管110‧‧‧導管本體500‧‧‧襯套510‧‧‧葉片部520‧‧‧保護器530‧‧‧連結部550‧‧‧外徑552‧‧‧外徑554‧‧‧外徑556‧‧‧外徑558‧‧‧直徑
