PROBLEM TO BE SOLVED: To provide an amide compound aqueous solution obtained by hydrating a nitrile compound and a method for efficiently producing an amide compound aqueous solution and to provide an amide-based polymer and a method for producing the polymer.;SOLUTION: There are provided: an amide compound aqueous solution containing 1 to 500 wt.ppm of nitrile hydratase; a method for producing an amide compound aqueous solution; an amide-based polymer obtained by polymerizing the amide compound; and a method for producing the polymer. The amide compound aqueous solution preferably does not contain a bacterial cell and/or its processed product.;SELECTED DRAWING: None;COPYRIGHT: (C)2019,JPO&INPIT
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