A CPU (31) of a musical instrument (1) calculates distances between central positions of a plurality of virtual pads (81) and a position of a marker unit (15), by making adjustment such that a distance is shorter as a size associated with the virtual pad (81) is larger. The CPU 31 identifies a virtual pad (81) corresponding to the shortest distance among the distances calculated, as a virtual pad (81) for outputting sound. The CPU (31) identifies a tone corresponding to the virtual pad (81) for outputting sound by referring to set layout information.