An electronic keyboard musical instrument which can realize natural sounds with favorable sound quality as an acoustic piano. A sound board (33) made of a plate member is vibrated so as to generate musical tones. A first performance signal generator (22) generates a first performance signal based on the operating state of a plurality of keys of a keyboard (17). A second performance signal generator (23) generates a second performance signal, which is different from the first performance signal, based on the operation of the plurality of keys and the operation of a pedal (18). Speakers (41A-41D) generate musical tones based on the first performance signal generated by the first performance signal generator (22). Transducers (21A-21C) mounted to the sound board (33) vibrate the sound board (33) based on the second performance signal generated by the second performance signal generator (23).