PROBLEM TO BE SOLVED: To provide a catheter having excellent torque transmission property and excellent flexibility, capable of being easily inserted into a closed part of a blood vessel, in which a curvature degree of the catheter is large, capable of easily returning to an original shape even when the catheter is deformed, capable of preventing fracture on a boundary between the catheter body and a tip end tip, and capable of improving operation property of a combined device such as a guide wire.SOLUTION: A catheter 1 comprises a coil body 20 formed by winding a stranded wire 30 in a hollow spiral state, the stranded wire is formed by twisting a first strand 31a and a second strand 31b.SELECTED DRAWING: Figure 7
