To provide a jig and method for analyzing the high temperature behavior of a fuel cell electrolyte membrane, allowing the measurement of the high temperature behavior of the fuel cell electrolyte membrane.

(1) The jig 1 for analyzing the high temperature behavior of the fuel cell electrolyte membrane comprises fixing means 2 for fixing the fuel cell electrolyte membrane 11 in a liquid, temperature changing means 3 for changing the temperature of the fuel cell electrolyte membrane 11 in the liquid, and a Raman spectroscopy device 4 for measuring the fuel cell electrolyte membrane. (2) The jig 1 for analyzing the high temperature behavior of the fuel cell electrolyte membrane comprises pressure granting means 7 for granting a pressure to a sample 11. (3) The liquid and the fixing means 2 are transparent or semitransparent. (4) The method for analyzing the high temperature behavior of the fuel cell electrolyte membrane comprises fixing the fuel cell electrolyte membrane 11 in the liquid with the fixing means 2, controlling the temperature of the fuel cell electrolyte membrane in the liquid to be an operating temperature with the temperature changing means 3, and analyzing the high temperature behavior of the fuel cell electrolyte membrane 11 with the Raman spectroscopy device 4.