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Two mutually cross-linkable two kinds of copolymers were prepared to use as humidity-sensitive membranes. The humidity-sensitive thin films consist of cross-linked polyelectrolytes of the following component: 4-vinylbenzyl dimethyl 2-(dimethylamino)ethyl ammonium chloride (1)/2-methacryloxyethyl trimethyl ammonium chloride (2)/2-ethoxyethyl acrylate (3)=1/2/1, 2/2/1, 2/3/1 and 3/2/1 and 4-vinylbenzyl...