PROBLEM TO BE SOLVED: To provide a dialysis system in which not only a base pipe for dialysis but also branch pipes are more surely sterilized by heat.SOLUTION: A dialysis system 10 comprises: one or more dialysis machines 20 a dialysate delivery system 16 which delivers dialysate to the dialysis machines 20 a loop-shaped base pipe 24 for dialysis which circulates liquid for dialysis delivered from the dialysate delivery system 16 one or more branch pipes 26 which connect the base pipe 24 for dialysis to the respective dialysis machines 20 and a heater unit 15 for heating which heats the liquid for dialysis flowing in the base pipe 24 for the dialysis. The dialysate delivery system 16 outputs cleaning fluid instead of the liquid for dialysis when cleaning and/or sterilizing the piping unit. The branch pipes 26 include one or more respective loop-shaped by-pass pipes 28 which come from and return to the base pipe 24 for dialysis.
