The object of the present invention is to provide a homunculus of a glenohumeral joint in which the supraspinatus and the infraspinatus are correctly connected to the superior humerus. A homunculus 10 includes a scapula part 1; a superior humerus part 2; a supraspinatus part 3; and an infraspinatus part 4. A tip 32 of the supraspinatus part 3 is fixed to the upper portion of a greater tubercle portion 2a of the superior humerus part 2. One side of a tip 42 of the infraspinatus part 4, the tip extending like a belt, forms a boundary with a tip edge of the supraspinatus part 3. Furthermore, the infraspinatus part 4 is removably engaged with the greater tubercle portion 2a of the superior humerus part 2 such that the tip 42 covers the greater tubercle portion 2a.