A musical instrument improved in sound tones and other properties is provided, the instrument body of which comprises a machinable ceramic-resin composite material. The instruments can be readily produced by a method which comprises impregnating a machinable ceramic article containing substantially continuous micropores with a liquid resin material and hardening the resin material, and then machine-processing the resulting machinable ceramic-resin composite article into an instrument body or body parts thereof having such shapes that conventional wood and/or metal materials have been used for the instrument body. When the instrument body is composed of a plurality of body parts, such body parts of the composite material are produced as mentioned above and assembled into the instrument body. The instrument body is then assembled with accessories into an musical instrument.