A balcony for attachment to a building wall having: - a balcony floor construction having a balcony floor top side and a balcony floor underside , - a carrier profile frame made of carrier profiles , forming a balcony floor covering for sections of the balcony floor underside , and - a holding system fixing the carrier profile frame , for attaching the balcony to a building wall wherein the balcony floor construction has a balcony floor structure constructed of at least two cassette elements extending along a common extension direction (E), wherein each cassette element seen in the cross-section perpendicular to the extension direction (E) is shaped in such a manner, - that it has a basis which forms a part of the balcony floor underside and - that at least one coupling leg having a coupling area spaced apart from the base , for connecting neighboring cassette elements and/or for applying a balcony floor cloth on the balcony floor structure extends starting from the base , wherein each coupling area has a positive fit section extending along the extension direction (E), by which neighboring cassette elements are connected to each other by positive fit, wherein the cassette elements , the carrier profile or both are made of beveled thin sheet, and between base and coupling leg of the cassette elements a coupling leg angle A of 60 to 70 degrees is formed, respectively, wherein the positive fit section of each coupling leg has a first positive fit section extending parallel to the base of the cassette element and wherein subsequent to the first positive fit section a second positive fit section extending in angled or curved manner away from the first positive fit section is formed. - a balcony floor construction having a balcony floor top side and a balcony floor underside , - a carrier profile frame made of carrier profiles , forming a balcony floor covering for sections of the balcony floor underside , and - a holding system fixing the carrier profile frame , for attaching the balcony to a building wall wherein the balcony floor construction has a balcony floor structure constructed of at least two cassette elements extending along a common extension direction (E), wherein each cassette element seen in the cross-section perpendicular to the extension direction (E) is shaped in such a manner, - that it has a basis which forms a part of the balcony floor underside and - that at least one coupling leg having a coupling area spaced apart from the base , for connecting neighboring cassette elements and/or for applying a balcony floor cloth on the balcony floor structure extends starting from the base , wherein each coupling area has a positive fit section extending along the extension direction (E), by which neighboring cassette elements are connected to each other by positive fit, wherein the cassette elements , the carrier profile or both are made of beveled thin sheet, and between base and coupling leg of the cassette elements a coupling leg angle A of 60 to 70 degrees is formed, respectively, wherein the positive fit section of each coupling leg has a first positive fit section extending parallel to the base of the cassette element and wherein subsequent to the first positive fit section a second positive fit section extending in angled or curved manner away from the first positive fit section is formed. <EOS>