[Problem to be solved] An object of the present invention is to provide a catheter in which the pushing force of an operator can be efficiently transmitted to the distal end, and a risk of being caught up at a curved region of a blood vessel, bile duct, pancreatic duct and the like can be reduced.[Solution] The catheters 10 has a configuration where the second core wires 80 can move to the optimal position depending on external forces 1, 2, 3, 4 exerted at a curved region of a blood vessel, bile duct, pancreatic duct and the like when the catheter 10 is inserted up to the curved region of a blood vessel, bile duct, pancreatic duct and the like. Therefore, a risk can be reduced that the first core wire 70 and the second core wire 80 interfere each other to prevent the catheter 10 from bending along a blood vessel, bile duct, pancreatic duct and the like, resulting in breakage of any one or both of the first core wire 70 and the second core wire 80.
