To solve the problem such as deforming, extending and bending, when a tube is pulled in the rotating direction, by a point of time of a ring-shaped pressurizing member.

A tube isolating member rotating in cooperation with an eccentric rotor, is inserted between the ring-shaped pressurizing member and the tube, and a phenomenon of sticking the tube to the ring-shaped pressurizing member is prevented, and the tube isolating member contacts with the tube, and rotates in the inverse direction of the rotating direction, and pushes back the tube in the inverse direction. Alternatively, a tube return member rotating in cooperation with the eccentric rotor is pushed against the tube crushed in a flat shape, and the tube is returned in a circular shape, and the phenomenon of sticking the tube to the ring-shaped pressurizing member is prevented, and an energizing means of pushing back the tube in the inverse direction by the tube return member is constituted as a part of the eccentric rotor, and the purpose is inexpensively attained without separately constituting a tube pulling preventive member.