A suspension device can be used to support a musical instrument for display. The suspension device has a holder and a mounting portion. The holder may be a clamp, is able to clamp and hold a musical instrument in position. The mounting portion has a stationary hook and a movable hook. The movable hook is connected with a resilient element that provides a force to pull the movable hook to move toward the stationary hook and therefor engages stably two support bars or support members at any intervals.