In a rotor of a conventional tube pump, a spring mechanism for absorbing pulsations or loads is made to match only either of rotational directions. The case, in which the tube pump is used in the direction opposite to the matched rotational direction, is limited to the case, in which large pulsations may occur. The spring mechanism has a low load-absorbing effect thereby to make it difficult to run the tube pump for a long time. The long-time run could be attained if the housing or motor were strengthened, but this strengthening raises the cost. A tube pump rotor of the present invention comprises a rotor element (2), a plurality of first swing portions (4a) supported pivotally at their base end portions by the rotor element (2), second arm-shaped swing portions (4b) supported pivotally at their base end portions individually by the first swing portions (4a), rollers (6) supported rotatably by the individual free ends of the second swing portions (4b), and buffer members ( 7a to 7 ) made to confront the side faces of the second swing portions (4b) so that the rollers (6) may be individually directed radially outward of the rotor (2).
