A medical catheter includes: a sheath having a guide wire lumen through which a guide wire is passed and a guide wire port formed in an outer peripheral surface, the guide wire port communicating with the guide wire lumen； a sloped portion that is a portion of the sheath dropped into the guidewire lumen, the sloped portion being provided continuously from an inner wall of the guide wire lumen through the guide wire port to the outer peripheral surface； and a reinforcing portion that is a portion of the sheath softened or melted to be deformed by heating, the reinforcing portion being provided to a proximal end side of the sloped portion in the guide wire lumen, wherein a height of the reinforcing portion is 30% or more of an inner diameter of the guide wire lumen.
