Provided is an electrolyte equipped with a hydrophilic portion having a cyclic quaternary ammonium salt and a hydrophobic portion bonded to the hydrophilic portion; and a fuel cell, a Li secondary battery, secondary battery and a primary battery using the electrolyte. The electrolyte has preferably a structure represented by the formula (A) or (B), wherein P′ represents a hydrophobic portion, R1 and R2 each represents hydrogen, fluorine, a hydroxy group, or a hydrocarbon or fluorinated hydrocarbon group having from 1 to 10 carbon atoms, R3 and R4 each represents a hydrocarbon, fluorinated hydrocarbon, or a fluorocarbon group having from 1 to 10 carbon atoms, r and s each represents an integer of 0 or greater but not greater than 8 and satisfies 1≦r+s≦8, u represents an integer and satisfies 2≦u≦9, and X− represents a counter anion.