To provide a portable foldable musical instrument holder which is convenient and suitable, especially to a stringed instrument, having a resonance body part.

The portable foldable musical instrument holder has a musical instrument holding plate 2, having a through hole for accommodating the resonance body part of a musical instrument and a holder-support leg member 3, attached to the musical instrument holding plate 2 and is freely to change the height. The holder-support leg is opened to support the musical instrument holding plate 2, and the resonance body part of a musical instrument is accommodated in the through hole 2a of the musical instrument holding plate, in addition, an extendable music score plate 7 can be provided on the front surface of the musical instrument holding plate 2.