[Object] To provide a dialysate extraction apparatus which can reliably perform cleaning and disinfecting on an inside of a collection port without extending a separate flow route from an on-off device. [Solution] There is provided a dialysate extraction apparatus including dialysate extraction device 9 having an inlet 9a and an outlet 9b which can circulate a liquid, and having a collection port 12 which can collect the circulating liquid； and a cap 10 which is attachable to and detachable from the collection port 12 of the dialysate extraction device 9 and which can turn on and off the collection port 12. In a state where the cap 10 is attached, the collection port 12 defines a guide route ± which guides the liquid introduced from the inlet 9a to a tip 12a side of the collection port 12, and a discharge route ² which discharges the liquid guided by the guide route ± to the outlet 9b side.
