PROBLEM TO BE SOLVED: To reliably detect that a motor shaft is slipped in an infusion pump.SOLUTION: An infusion pump (10) rotates a plurality of rollers (104) provided inside a cassette (100) along the inner peripheral surface of an arc-shaped wall (103) of the cassette to squeeze a tube (200) with flexibility provided around the inner peripheral surface of the arc-shaped wall, by the plurality of rollers and deliver liquid in the tube. The infusion pump (10) includes: a motor (53) a motor shaft (5) rotatingly driven by the motor and coming into contact with the outer peripheral surfaces of the plurality of rollers to rotate the plurality of rollers pressure sensors (81 and 82) for detecting occlusion pressure of the tube and a control section (50) for drivingly controlling the motor. When detecting that a detection signal of the pressure sensors does not fluctuate during the driving control of the motor, the control section (50) detects that the motor shaft is slipped without rotating the plurality of rollers.
