An artificial elbow joint of constraint type that makes it easier to assemble a joint section even when a surgery for replacing an elbow joint is in process, and is effective in improving the safety of surgery and reducing the time taken to complete the surgery. The artificial elbow joint of the present invention comprises: a humeral component comprising a humeral stem, a shaft and a anterior flange; and an ulnar component comprising an ulnar stem and a sleeve, wherein the shaft of the humeral component is fitted in the sleeve of the ulnar component rotatably. The sleeve has a slit-like sleeve opening a width of which is smaller than an outside diameter of the shaft and having a flexible sleeve insert on inner surface of the sleeve to be contacted with the shaft whereby the sleeve is fitted with a snap into the sleeve through the sleeve opening, and a centerline of the sleeve opening is oriented toward an anterior cubital region at an angle between 45 to 90 degrees with respect to a downward direction of an axis of the ulnar stem.