An aqueous solution formulation containing Compound (I) can be manufactured by performing a first step of preparing a dissolution liquid obtained by dissolving a compound represented by Formula (I) below or a pharmacologically acceptable salt thereof and a compound represented by any of General Formulas (II) to (IV) below in an organic solvent, a second step of removing the organic solvent from the dissolution liquid, and a third step of adding a solution to residual substances obtained through the second step to dissolve the residual substances.
