Gel electrolyte

The present invention is characterized by containing: a polymer obtained by polymerizing, for example, an imidazolium salt having an alkenyl group represented by formula (1-1) and a compound having, for example, imidazolium salts having alkenyl groups at both ends represented by formula (2-1); inorganic nanofibers; and a liquid. A gel electrolyte obtained by swelling a polymer using the liquid shows proton conductivity equivalent to that of Nafion in a normal temperature range, shows proton conductivity of Nafion or more in a high temperature range exceeding 60 DEG C, and has good strength. (In the formula, X-represents a monovalent anion, Y-each independently represents a monovalent anion, and n represents an integer of 1-20. ) ...