A guide system for guiding at least one door wing movably-supported relative to a furniture carcass, comprising: - a first guide rail for guiding the at least one door wing, - a second guide rail for guiding the at least one door wing, the second guide rail extending transversely relative to the first guide rail in a mounted condition, - at least three furniture hinges by which the at least one door wing is configured to be connected or is connected to the carrier in the mounted condition, - a carrier configured to be displaceable at least along the second guide rail, the carrier being connected or being configured to be connected to the at least one door wing via at least three furniture hinges which are to be arranged or which are arranged spaced apart from each other in the mounted condition, wherein the carrier has a longitudinal direction, wherein for the improved support of the carrier, at least one further guide rail is provided along which at least one running wheel of the carrier is displaceably supported, - wherein a mounting member separate from the carrier is provided, and all furniture hinges are commonly arranged or are configured to be commonly arranged on the mounting member, wherein the mounting member is releasably connectable to the carrier via at least one fastening device (18a, 18b), and that the mounting member is releasably connectable to the carrier in a direction extending transversely to the longitudinal direction of the carrier, characterized in that at least one adjustment device (35a, 35b) is provided by which a position of the mounting member relative to the carrier is adjustable in a connected condition of the mounting member on the carrier, wherein the at least one adjustment device (35a, 35b) includes at least one rotationally supported adjustment wheel (28a, 28b), and wherein a position of the mounting member relative to the carrier is adjustable by a rotation of the adjustment wheel (28a, 28b). - a first guide rail for guiding the at least one door wing, - a second guide rail for guiding the at least one door wing, the second guide rail extending transversely relative to the first guide rail in a mounted condition, - at least three furniture hinges by which the at least one door wing is configured to be connected or is connected to the carrier in the mounted condition, - a carrier configured to be displaceable at least along the second guide rail, the carrier being connected or being configured to be connected to the at least one door wing via at least three furniture hinges which are to be arranged or which are arranged spaced apart from each other in the mounted condition, wherein the carrier has a longitudinal direction, wherein for the improved support of the carrier, at least one further guide rail is provided along which at least one running wheel of the carrier is displaceably supported, - wherein a mounting member separate from the carrier is provided, and all furniture hinges are commonly arranged or are configured to be commonly arranged on the mounting member, wherein the mounting member is releasably connectable to the carrier via at least one fastening device (18a, 18b), and that the mounting member is releasably connectable to the carrier in a direction extending transversely to the longitudinal direction of the carrier,