To provide a curable aqueous composition which has a high low-temperature curing rate, a long pot life, excellent weatherability, and low staining properties when used as a coating material.

The curable aqueous composition contains an aqueous product of a composite resin (ABC) obtained by dissolving or dispersing, in an aqueous medium, the composite resin (ABC) constituted by bonding through a silicon-oxygen bond a polysiloxane segment (B) of a composite resin (AB) produced by chemically bonding a polymer segment (A) having a neutralized acid group to the polysiloxane segment (B), to a polysiloxane segment (C) derived from a condensation product (c) of an alkyltrialkoxysilane having a 1-3C alkyl group. The composite resin (ABC) contains a specific chemical structure including a hydroxy group, an ester group, and a silyl group.