A tube unit includes an inner tube that is elastically deformable and has a tubular shape, and a pressurized space forming portion that forms a pressurized space in contact with an outer peripheral surface of the inner tube between the inner tube and the pressurized space forming portion. The inner tube is operable between a minimum pressure state and a maximum pressure state. The inner tube has a cross-section having a non-circular shape perpendicular to an axial direction in the minimum pressure state. A transport apparatus includes the tube unit and a pressure controller.