Respective waveform data on pad strike sounds, rim strike sounds, and rim-shot sounds are stored in a waveform memory, and when a CPU detects a strike detection signal outputted by either of a pad sensor, and a rim sensor, provided in a head unit, a musical tone generating controller reads out waveform data on an strike sound corresponding to the strike detection signal from the waveform memory, thereby generating a musical tone signal corresponding thereto before outputting. Thereafter, when the CPU detects a strike detection signal outputted by the other of the pad sensor, and the rim sensor within a predetermined time, waveform data on a rim-shot sound are read out from the waveform data memory, thereby generating a musical tone signal corresponding thereto before outputting. A sound output unit produces electronic strike sounds corresponding to those musical tone signals, respectively.