A viola/violin shoulder rest includes a first pad and a second pad made of soft foamed plastic material. A retainer is fixed between the first pad and the second pad. Each of the first pad and the second pad is formed with a sound reflection area which is a through hole. The sound reflection area of the first pad is alternatively stuffed with a natural sponge block. The sponge block is selectively coated at its top a gold foil. A number of feet made of silicon gel are fixed on the first pad in delta arrangement. A number of fastening posts are disposed on an upper surface of the retainer. A resilient band extends through where between the retainer and the second pad for the viola/violin player to deliver optimal sound color and quality.