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Disclosed is a method for producing acrolein, which can produce acrolein in high yield by the dehydration of glycerin. The method is characterized by carrying out the dehydration of glycerin in the co-presence of a catalyst and glycerin, wherein the catalyst comprises a crystal of a rare earth metal salt of phosphoric acid, and is produced by adding a phosphate ion to a solution comprising water, a hydroxide of a rare earth metal and/or a dehydration condensation product of the hydroxide to produce a solid component, and then firing the solid component.