To simply measure the dissolution concentration of the dissolved matter in a sample solution, even if an expensive and complicated device is not used.SOLUTION: A dissolved matter concentration measuring device 1 of the present invention is the device to measure the dissolution concentration of the dissolved matter in a sample solution 14, and includes: a reception unit 15 capable of receiving the sample solution 14; a tube where at least a portion is arranged in the reception unit 15, the porous tube 10 that includes a hole capable of passing the dissolved matter from an outside surface 19 to the inside 11; a measurement unit 20 connected to an opening end 12 of the tube 10, and measuring the gas concentration of the dissolved matter passing the inside 11 of the tube 10; and a supply unit 30,32 for supplying the dissolved matter of the inside 11 of the tube 10 to the measurement unit 20. In the dissolved matter concentration measuring device, the tube 10 makes the dissolved matter in the sample solution 14 pass from the outside surface 19 to the inside 11 of the tube 10, and thereby separates the dissolved matter from the sample solution 14. Also, a dissolved matter concentration measuring method using the same is related.SELECTED DRAWING: Figure 1
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