| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic keyboard musical instrument which sufficiently ensures rigidity to endure vibration due to a sound pressure and is capable of outputting a large sound.SOLUTION: The electronic keyboard musical instrument includes a musical instrument case 1 provided with a keyboard part 5, and a speaker box 6 which is provided in the musical instrument case 1 along a key array direction of the keyboard part 5 and is formed of a material having higher rigidity than the musical instrument case 1. Consequently, rigidity can be ensured by the speaker box 6, so the rigidity of the entire musical instrument case 1 can be enhanced though the musical instrument case 1 is formed of synthetic resin. Thus, the tone quality of a speaker 20 can be improved and the sound volume of the speaker 20 can be increased, and a large sound can be surely and satisfactorily outputted by the speaker 20 because the speaker box 6 can sufficiently endure vibration due to a sound pressure of the speaker 20 though the tone quality of the speaker 20 is improved and the sound volume of the speaker is increased. |
