A medical tube 10 includes a main shaft tube 20 that internally has a main shaft lumen 21, and a plurality of branch tubes 30 connected to each other at an intermediate position in an axial direction of the main shaft tube 20. The branch tube 30 has a branch lumen 31 through which pancreatic juice flows into the main shaft lumen 21. In a state where the main shaft tube 20 is inserted into a pancreas 100, a distal end of the branch tube 30 is disposed at a position separated outward from the main shaft tube 20 in a radial direction between the pancreas 100 and a jejunum 200.
