A furniture board with an integrated or inserted flap fitting includes a lever mechanism having a plurality of levers guiding a flap of a furniture item. The flap fitting has a spring unit acting on at least one lever of the lever mechanism via an adjustable preload. The lever mechanism, in a closed position of the guided flap, moves into a front-side opening of the flap fitting and a front-side opening of the furniture board. The preload of the spring unit and/or the transmission ratio between the spring unit and the lever mechanism is adjustable via an adjusting element having a tool receptacle. The tool receptacle is accessible through a front-side opening in the furniture board and/or the flap fitting.