PROBLEM TO BE SOLVED: To provide a dialysate discharging apparatus in which the inside of a pickup port is reliably cleaned and sterilized without extending a separate flow path from an opening/closing means.SOLUTION: The dialysate discharging apparatus includes: a dialysate discharging means 9 in which an inlet port 9a and an outlet port 9b both capable of flowing a liquid is formed, and a pickup port 9c enabling the flowing liquid to be picked up are formed and a cap 10 which can be detachably attached to the pickup port 9c of the dialysate discharging means 9, and can open and close the pickup port 9c. In the apparatus, the cap 10 includes: a sealing means 11 for sealing between the cap C and the outer peripheral surface of the pickup port 9c and a defining means 12 for defining the inside of the pickup port 9c in a state of being attached to the pickup port 9c, and forming a guide path &alpha for guiding the liquid introduced through the inlet port 9a into the pickup port 9c and a discharge path &bgr for discharging the liquid guided by the guide path &alpha to the outlet port 9b side.
