A foldable golf bag cart includes a connecting seat that has two tubular walls, each of which is formed with an interior pivot hole and a swing hole, and a positioning member that is movably mounted on a rear wheel leg. The swing hole has a swing section, an abutment section, and an insert section. When the positioning member is moved in the insert section, the rear wheel leg is pushed into the abutment section so that the rear wheel leg is prevented from moving forwardly and rearwardly. When the positioning member is disengaged from the insert section, the rear wheel leg extends into the swing section and is movable forwardly to a folded position.