Embodiments of the present disclosure relates to a string instrument, such as a guitar, having a neck support-fingerboard brace unit. The neck support fingerboard brace unit is formed as a unitary unit or formed by fixedly attaching a neck support to a fingerboard brace before attaching the neck support fingerboard brace to a guitar top. The solid connection between the neck support and the fingerboard brace allows the fingerboard brace, which rests on a guitar side, to provide support to the guitar neck, thus, reducing deformation in the guitar neck and the fret board.