Abstract: The invention comprises an adjustable case for stringed instruments, such as violins, violas, or guitars, which may have different body sizes within any given type. The case has a transverse interior fixed wall, preferably contoured for the button or lower end of the instrument body. This wall can be adjusted longitudinally to form a snug fit for any instrument having a body size within the adjustment range. The moveable wall has a cut-out area to act as a bearing surface for the neck of the instrument and tie-down straps to further eliminate movement during transit. A resilient pad, generally located on the floor of the case, is associated with each end wall structure. These support the sturdier end areas of the back of the body so that the more fragile central portion of the back is held above the bottom panel of the case. Thus, an impact to the outside of the case is not transmitted directly to the instrument.