Abstract: A medical tube is provided which can reduce the acoustic power level therein when air is supplied through the tube. The medical tube includes: a reference side bellows tube portion configured to be a flexible bellows-like tube including a plurality of reference rings in series in an axial direction, the reference rings each extending annularly or helically to form a ring; and a deformed side tube portion configured to be a tube shaped differently from the reference side bellows tube portion. Here, a plurality of the reference side bellows tube portions and a plurality of the deformed side tube portions are alternately arranged in the axial direction. At least one of the reference side bellows tube portions has an axial length less than 112 mm.