Tube pump

A tube pump comprising:

• a housing in which a flexible tube is arranged along a lateral wall formed to have a substantially horseshoe shape;
• a rotor rotatably provided inside the lateral wall of the housing;
• and
• a roller provided for the rotor so as to move along the lateral wall, wherein
• the lateral wall is provided with a blockage section which has an arc with a prescribed radius centered on a rotation center of the rotor and which presses and blocks the flexible tube between the roller and the lateral wall and a separation section which is provided on a downstream side of the blockage section and which is shaped so as to gradually distance away from the rotation center,
• the lateral wall is provided, between the blockage section and the separation section, with a pressure release section which has an arc centered on the rotation center of the rotor while having a radius larger than that of the blockage section, and
• while the roller is moving through the pressure release section, a communication opening is formed in the flexible tube pressed by the roller so as to allow communication between a part positioned on an upstream side and a part positioned on a downstream side of the roller, while a size of the communication opening is maintained to be constant.