A fastening arrangement having a lightweight board, in particular a wall board, for mounting on a wall, the fastening arrangement comprising the following: - a lightweight board, which extends from a rear narrow side (4.1) to a front narrow side (4.2) in an extension direction and has an upper covering board, a lower covering board spaced apart vertically from the upper covering board, and a light middle layer arranged therebetween, - at least two retaining parts, which each have a supporting section (7.1) for bearing the lightweight board, which supporting section has a top side (7.11), which faces the upper covering board when in the mounted state, and an underside (7.12), which faces the lower covering board when in the mounted state, - at least one fastening means, which can be anchored in the wall, and - at least one receptacle for the respective retaining part, which extends in the extension direction from the rear narrow side (4.1) between the covering boards (5a, 5b) into the interior of the lightweight board, - the supporting section (7.1) of the respective retaining part being arranged in the receptacle in the interior of the lightweight board and touching the upper covering board when in the mounted state, characterised in that - the at least two retaining parts furthermore each have a wall fixing section (7.2), which is formed integrally with the supporting section (7.1) and has at least two fastening means receptacles (7.21a, 7.21b), which are spaced apart from each other, for the fastening means that can be anchored in the wall, - one part (7.22a, 7.22b) of the wall fixing section (7.2) is arranged on either side of the supporting section (7.1), which lies laterally to the supporting section (7.1) in relation to the extension direction, and - each of said parts (7.22a, 7.22b) of the wall fixing section (7.2) is provided with at least one fastening means receptacle (7.21a, 7.21b). - a lightweight board, which extends from a rear narrow side (4.1) to a front narrow side (4.2) in an extension direction and has an upper covering board, a lower covering board spaced apart vertically from the upper covering board, and a light middle layer arranged therebetween, - at least two retaining parts, which each have a supporting section (7.1) for bearing the lightweight board, which supporting section has a top side (7.11), which faces the upper covering board when in the mounted state, and an underside (7.12), which faces the lower covering board when in the mounted state, - at least one fastening means, which can be anchored in the wall, and - at least one receptacle for the respective retaining part, which extends in the extension direction from the rear narrow side (4.1) between the covering boards (5a, 5b) into the interior of the lightweight board, - the supporting section (7.1) of the respective retaining part being arranged in the receptacle in the interior of the lightweight board and touching the upper covering board when in the mounted state, characterised in that - the at least two retaining parts furthermore each have a wall fixing section (7.2), which is formed integrally with the supporting section (7.1) and has at least two fastening means receptacles (7.21a, 7.21b), which are spaced apart from each other, for the fastening means that can be anchored in the wall, - one part (7.22a, 7.22b) of the wall fixing section (7.2) is arranged on either side of the supporting section (7.1), which lies laterally to the supporting section (7.1) in relation to the extension direction, and - each of said parts (7.22a, 7.22b) of the wall fixing section (7.2) is provided with at least one fastening means receptacle (7.21a, 7.21b).