A medical tube includes a tubular core layer and an outer layer arranged at an outer periphery of the core layer and having an outer peripheral surface substantially parallel to an axial direction of the medical tube. The core layer has a tubular inner core layer composed of a fluorine-based resin, and an outer core layer composed of a resin having a Young's modulus higher than that of the fluorine-based resin and arranged at an outer periphery of the inner core layer. The core layer has a specific configuration in which crest portions protruding toward a radially outer side of the medical tube and valley portions protruding toward a radially inner side of the medical tube are arranged repeatedly in the axial direction of the medical tube.