Provided is an aqueous coating liquid that can form a resin layer that reduces coating omission and interference spots of a coating film when applied to a substrate and that is excellent in mold release properties with an adhesive material. An aqueous coating agent comprising an acid-modified polyolefin resin (a) and an additive (B), wherein the additive (B) is at least one compound selected from the group consisting of an amphiphilic compound, acetylene glycol, and ethylene oxide adduct of acetylene glycol, Wherein the content of the additive (B) is more than 3 parts by mass and 50 parts by mass or less relative to 100 parts by mass of the acid-modified polyolefin resin. None

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