[Problems to be Solved] The present invention aims to provide a method for efficiently producing a high-purity alkoxyindanone derivative while maintaining an industrially superior volumetric efficiency.[Solution] Provided is a method for producing an alkoxyindanone derivative represented by a general formula in FIG. 2 (wherein R represents an alkoxy group containing 1 to 6 carbon atoms and n represents an integer of 1 to 4), comprising reacting an alkoxyphenylpropionic acid derivative represented by a general formula in FIG. 1 (wherein R and n are as defined above) with a condensing agent, adding an organic solvent to the resulting reaction mixture, and subsequently decomposing the condensing agent with an aqueous alkaline solution.