PROBLEM TO BE SOLVED: To provide an auxiliary device for a violin family, which enables a performer to play a violin without sandwiching it between a shoulder and a jaw. SOLUTION: A violin family auxiliary device 10 is arranged on a plate-shaped pedestal 101, a surface side of the pedestal, and holds a resonance box of a musical instrument from the back side, a first holding portion 102 and a second holding portion 103. Has. Further, it is arranged on the back surface side of the pedestal, and a mounting portion 107 for placing the pedestal on the upper arm of the performer, extending from the upper arm of the performer to the shoulders and back, and engaging at least on the back or waist of the performer. It has a stopable hook 109 at one end and a strap 108 connected to the pedestal at the other end. The first holding part holds the resonance box from the back side at a position relatively closer to the sill of the musical instrument than the second holding part, and shakes the musical instrument with reference to the pedestal according to the performance of the performer. It has an arm 105a (b) that enables movement. Further, the second holding portion has an adjusting member 106a (b) that arbitrarily adjusts the distance from the pedestal to the resonance box. [Selection diagram] Fig. 1
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