To provide a guide wire capable of suppressing the degradation of medical economy that would be caused by preparing and using a plurality of types of guide wires with a different load at a distal end.SOLUTION: A guide wire 100 includes: a luminal body 110 comprising a distal end 111, a proximal end 113, and a lumen 115 extending between the distal end and the proximal end； a core member 140 movably inserted into the lumen of the luminal body along a longitudinal direction of the luminal body； and a stretching member 180 located at the distal end of the luminal body and having a peripheral wall portion 186 which is stretchable according to the movement of the core member relative to the luminal body. The stretching member has an overlapping portion 189 with which at least a part of the peripheral wall portion overlaps in a radial direction of the core member while contracted along the longitudinal direction.SELECTED DRAWING: Figure 2【課題】先端荷重の異なる複数種類のガイドワイヤを準備および使用することに伴う医療経済性の低下を抑制できるガイドワイヤを提供する。【解決手段】ガイドワイヤ１００は、先端１１１、基端１１３、および先端と基端との間に延びる内腔１１５を備える管腔体１１０と、管腔体の内腔に、管腔体の長軸方向に沿って移動可能に挿通されたコア部材１４０と、管腔体の先端に配置され、管腔体に対するコア部材の相対的な移動に伴い長軸方向に伸縮可能な周壁部１８６を有する伸縮部材１８０と、を有し、伸縮部材は、長軸方向に収縮した状態において、周壁部の少なくとも一部がコア部材の放射方向に重なる重なり部１８９を有する。【選択図】図２
