An object of the present invention is to provide a musical performance device capable of changing layout information, such as information regarding the arrangement of a virtual musical instrument set, by an intuitive operation. In the present invention, when position coordinates detected at a shot timing are within one of the areas of a plurality of virtual pads, a CPU designates a virtual pad in this area as a target of positional change. Then, the CPU determines a position where the virtual pad designated as a target of positional change is placed by this positional change, based on position coordinates detected at shot timings, and changes the position of the virtual pad designated as a target of positional change to the determined position.