PROBLEM TO BE SOLVED: To provide a sample holding device and a spectroelectrochemical measurement system capable of appropriately performing spectroelectrochemical measurement of various metal materials. SOLUTION: A sample holding device 12 has a reaction chamber 28 having an injection port and a discharge port, a supply tube 40 for supplying an electrolytic solution to the reaction chamber 28 through the injection port, and a reaction chamber via the discharge port. A delivery tube 42 that sends out the electrolytic solution discharged from the 28 to the outside, and a pedestal 30 that supports the working electrode 14 in the reaction chamber 28 so that the measurement surface 14a of the working electrode 14 made of a metal sample comes into contact with the electrolytic solution. , The counter electrode support member 44 that supports the counter electrode 16 so as to be immersed in the electrolytic solution, the reference electrode support member 46 that supports the reference electrode 18 so as to be immersed in the electrolytic solution, and the measurement surface 14a of the working electrode 14. Is provided with a probe support member 48 that supports the probe 22 for irradiating light and receiving the reflected light reflected by the measurement surface 14a. [Selection diagram] Fig. 1
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