A medical tube includes a distal portion provided on one end side having a first outer diameter, a first inner diameter, and a first thickness； a proximal portion provided on the other end side having a second outer diameter greater than the first outer diameter, a second inner diameter greater than the first inner diameter, and a second thickness greater than the first thickness； and an intermediate portion provided between the distal portion and the proximal portion and having an outer diameter, an inner diameter, and a thickness which gradually vary. Thus, a medical tube is provided having improved operability and which reduces the likelihood of bending during an operation.
