METHOD FOR PRODUCING (METH)ACRYLIC ACID

PROBLEM TO BE SOLVED: To provide a method for producing (meth)acrylic acid, which is capable of stably continuing an operation for a long period of time by suppressing the formation of a polymer by the polymerization of (meth)acrylic acid in a collection column and a distillation column.SOLUTION: The method for producing (meth)acrylic acid includes: a (meth)acrylic acid formation step of obtaining a (meth)acrylic acid-containing gas from a raw material for producing (meth)acrylic acid; and a collection step of obtaining a crude (meth)acrylic acid solution from the (meth)acrylic acid-containing gas. In a collection column used in the collection step, a gas supply port for supplying the (meth)acrylic acid-containing gas, a first supply port and a second supply port for introducing a polymerization inhibitor-containing solution, and a collection solvent introduction port for introducing a collection solvent exist in this order from the column bottom in the height direction. In the collection step, the polymerization inhibitor-containing solution is introduced from both the first supply port and the second supply port.