A foldable shopping cart seat includes a back with a hook extending between columns for hanging the back on a shopping cart front. Side rails slidably disposed along corresponding columns and downwardly extendable therefrom support a seat having parallel front and back rails with a pliable material extending therebetween. Scissor-like cross pieces extend between a front and back rail of the seat and are pivotably attached thereto for enabling the seat to fold against the back for carrying the shopping cart seat to and from a retail store and supporting the seat on the floor adjacent a shopping cart front.