Provided is a method for efficiently producing (meth) acrylic acid or a salt thereof obtained by hydrolyzing (meth) acrylamide. A method for producing an amidase-containing microbial cell, comprising reacting (meth) acrylamide with at least one selected from the group consisting of microbial cells and microbial cell-treated products containing amidases derived from at least one bacterium selected from the group consisting of the genus Pseudomonas and the genus Acydophilium, A method for producing (meth) acrylic acid or a salt thereof. None
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