The present invention relates to a developing solution producing apparatus for obtaining a developing solution by mixing a developing stock solution with pure water and containing a developer component at a predetermined concentration, and a method for producing a developing solution using the developing solution producing apparatus. The developing apparatus for producing the developer is supplied to the mixing tank by means of an ultrasonic concentration meter and an output signal from the ultrasonic concentration meter for measuring the developer components contained in the developing solution in the mixing tank mixing tank which is provided with a means for accommodating and mixing the developer stock solution with pure water. Flow control means for regulating the supply flow rate of the developing stock solution and / or pure water, and a storage tank for containing and storing a developing solution containing a developer component of a predetermined concentration in the mixing tank.
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