This catheter is provided with: a tube body having a first hole that extends in an axial direction an optical fiber disposed in the first hole a ring-shaped marker that is disposed around the outer periphery of a leading end of the tube body a first fixing member that is fixed to the optical fiber in such a manner as to be situated at one side of the marker in the axial direction and that has an outer width greater than an inner width of the first hole in at least one direction perpendicular to the axial direction and a second fixing member that is fixed to the optical fiber in such a manner as to be situated on the other side of the marker in the axial direction and that has an outer width greater than the inner width of the first hole in at least one direction perpendicular to the axial direction.本發明之導管具備:管體,其具有於軸向延伸之第1孔;光纖,其配置於第1孔內;環狀之標記,其配置於管體之前端部之外周;第1固定構件,其係以於軸向位於標記之一側之方式固定於光纖,且於與軸向垂直之至少1個方向具有大於第1孔之內寬之外寬;及第2固定構件,其係以於軸向位於標記之另一側之方式固定於光纖,且於與軸向垂直之至少1個方向具有大於第1孔之內寬之外寬。2‧‧‧前端部4‧‧‧管體4a‧‧‧前端部5‧‧‧第1孔6‧‧‧第2孔7‧‧‧光纖8‧‧‧標記9‧‧‧第1固定構件10‧‧‧第2固定構件A‧‧‧軸向
