A dialysis-fluid supply system that generates dialysis fluid by mixing a diluent and at least two drugs and outputs the dialysis fluid, the system comprising: a mixing tank that generates dialysis fluid by mixing the drugs and the diluent; a storage tank that stores therein the dialysis fluid generated by the mixing tank and outputs the dialysis fluid; a transfer mechanism that transfers the dialysis fluid generated by the mixing tank to the storage tank; an output mechanism that outputs the dialysis fluid stored in the storage tank to a dialysis device; a concentration sensor that detects a concentration of the dialysis fluid within the mixing tank; and a control unit that controls driving of the transfer mechanism and the output mechanism, wherein the dialysis-fluid supply system is an individual dialysis-fluid supply system used for treatment of one patient; the at least two drugs are provided in a powder form; the at least two drugs are individually packaged in an amount necessary for each generation of the dialysis solution; the dialysis-fluid supply system further comprises a drug supply device that supplies the at least two drugs directly to the mixing tank; the dialysis fluid is obtained by mixing and diluting a drug A and a drug B; the drug A comprises an electrolyte component, a pH adjuster, and sugar; the drug B comprises sodium bicarbonate; and the control unit controls the drug supply device to execute a process of supplying water together with the drug B to the mixing tank and thereafter detecting the concentration of the drug B within the mixing tank by the concentration sensor and a process of supplying water together with the drug A to the mixing tank and thereafter detecting the concentration of the drug A within the mixing tank by the concentration sensor. a mixing tank that generates dialysis fluid by mixing the drugs and the diluent; a storage tank that stores therein the dialysis fluid generated by the mixing tank and outputs the dialysis fluid; a transfer mechanism that transfers the dialysis fluid generated by the mixing tank to the storage tank; an output mechanism that outputs the dialysis fluid stored in the storage tank to a dialysis device; a concentration sensor that detects a concentration of the dialysis fluid within the mixing tank; and a control unit that controls driving of the transfer mechanism and the output mechanism, wherein the dialysis-fluid supply system is an individual dialysis-fluid supply system used for treatment of one patient; the at least two drugs are provided in a powder form; the at least two drugs are individually packaged in an amount necessary for each generation of the dialysis solution; the dialysis-fluid supply system further comprises a drug supply device that supplies the at least two drugs directly to the mixing tank; the dialysis fluid is obtained by mixing and diluting a drug A and a drug B; the drug A comprises an electrolyte component, a pH adjuster, and sugar; the drug B comprises sodium bicarbonate; and the control unit controls the drug supply device to execute a process of supplying water together with the drug B to the mixing tank and thereafter detecting the concentration of the drug B within the mixing tank by the concentration sensor and a process of supplying water together with the drug A to the mixing tank and thereafter detecting the concentration of the drug A within the mixing tank by the concentration sensor.