[Problem] To provide a medical tube which is simpler to handle and restricts bending during operation thereof. [Solution] A medical tube (5) comprises: a tip-end section (51) which is provided at one end of the medical tube (5) and has a first outer diameter (A11), a first inner diameter (B11), and a first thickness (D11)； a base-end section (52) which is provided at the other end of the medical tube (5) and has a second outer diameter (A12) which is greater than the first outer diameter (A11), a second inner diameter (B12) which is greater than the first inner diameter (B11), and a second thickness (D12) which is greater than the first thickness (D11)； and an intermediate section (53) which is provided between the tip-end section (51) and the base-end section (52) and has an outer diameter (A13), inner diameter (B13), and thickness (D13) which gradually change.
