PROBLEM TO BE SOLVED: To provide an anion exchanger which can be used as an ion conductivity-imparting agent used in a fuel cell or water electrolysis apparatus using an anion exchange membrane, and has heat resistance, insolubilization of the ion conductivity-imparting agent and high ion exchange. To provide an anion exchanger compatible with capacity. SOLUTION: A crosslinked structure having a quaternary ammonium group as an ion exchange group while imparting heat resistance by using a styrene polymer in which the chain length of the alkyl group between the ion exchange group and the aromatic ring is extended. By using this, it is possible to achieve both insolubilization and high ion exchange capacity. [Selection figure] None
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