Abstract: A shoulder support for a violin or similar string instrument secures to the periphery of the instrument by clamping on an axis generally aligned with the peripheral vertical edge, i.e., the rib, of the instrument. The support comprises a mounting device which clamps to the instrument and a padded rest which may be readily assembled to and disassembled from the mounting device. The position and orientation of the padded rest is adjustable relative to the mounting device and body of the string instrument. The mounting device may also include means for mounting a conventional chin rest on the upper portion of the instrument.