[Problem] To provide a compound useful as an active ingredient in a pharmaceutical composition for treating bladder storage disorders, dysuria, lower urinary tract diseases, and the like. [Solution] The inventors of the present invention have discovered that a 2-aminothiazole derivative exhibits an excellent muscarinic M 3 receptor positive allosteric modulator activity, and has potential as a preventative or therapeutic agent against bladder and urinary tract diseases to which bladder contraction mediated by muscarinic M 3 receptors contributes. The 2-aminothiazole derivative or salt thereof has potential as a preventative or therapeutic agent against bladder and urinary tract diseases such as, for example, dysuria including underactive bladder, and to which bladder contraction mediated by muscarinic M 3 receptors contributes.
