There is provided a medical tube that can be improved in operability and prevented from bending during an operation. A medical tube 5 includes a distal portion 51 that is provided on one end side and has a first outer diameter All, a first inner diameter B11, and a first thickness D11； a proximal portion 52 that is provided on the other side and has a second outer diameter A12 greater than the first outer diameter All, a second inner diameter B12 greater than the first inner diameter B11, and a second thickness D12 greater than the first thickness D11； and an intermediate portion 53 that is provided between the distal portion 51 and the proximal portion 52 and of which an outer diameter A13, an inner diameter B13, and a thickness D13 gradually vary.
