An electronic keyboard musical instrument includes a body unit of the musical instrument and a stand attached to the body unit. The stand includes a pair of side boards disposed in a standing manner so as to interpose the body unit therebetween. The body unit includes a pair of lateral surfaces. Each of the pair of lateral surfaces faces one of the pair of side boards and includes a first engaging portion disposed thereon. Each of the pair of side boards includes a first engaged portion engaged by the first engaging portion and disposed on an inner lateral surface thereof, which faces one of the pair of lateral surfaces of the body unit. The first engaging portion and the first engaged portion are engaged with each other by at least one of the body unit and the stand being moved in a predetermined direction.