Polymerizable composition, ion exchange resin, ion exchange membrane, membrane electrode assembly, and hydrogen production device

A polymerizable composition comprising:

• a quaternary ammonium salt represented by the following Formula (I);
• a polymerizable monomer;
• a linear or branched alkylene glycol having carbon number of 1 or more and 4 or less;
• and
• at least one hydroxy group-containing compound selected from the group consisting of a primary alcohol having carbon number of 4 or more and 15 or less, a secondary alcohol having carbon number of 4 or more and 15 or less, and a diol having carbon number of 5 or more and 15 or less, the diol having a hydroxy group bonded to a secondary carbon atom:
• wherein
• R1 represents an alkenyl group having carbon number of 2 or more and 5 or less,
• R2 represents an alkylene group having carbon number of 1 or more and 10 or less,
• R3, R4, and R5 each independently represent a linear or branched alkyl group having carbon number of 1 or more and 4 or less or a linear or branched alkoxy group having carbon number of 1 or more and 4 or less, and
• X− is an anion.