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 to 41D generates musical tones based on the first performance signal generated by the first performance signal generator 22. Transducers 21A to 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.