u201d in fig5 at range the upstream side valve 51 occludes the infusion tube 30 and the downstream side valve 52 release the occlusion on the infusion tube 30 the fluid is discharged by the inclined surface of the v groove 53 v of the pump block 53 to press the infusion tube 30 one of the elements for increasing the flow rate accuracy of the infusion pump is to increase the proportion of discharging time as much as possible after considering various conditions such as the opening and closing timings of the valve or elastic force of the tube it is necessary to set a wide cam angle range of the pump block cam 53 c for discharging pumping in the related art in which the pumping operational is performed using a driving component for pressing the tube operating the cam at upstream side valve and operating the cam at the downstream side valve it is not likely that the cam angle range of the pump block cam 53 c can be set larger than 60 u00b0 however in the present embodiment different cams are used to change the operational angles of the pump block 53 the upstream side valve 51 and the downstream side valve 52 thus a wider range can be designed as a result the cam angle range may be set to at least 70 u00b0 in addition according to.