We evaluated the effect of jidabokuippo for postoperative finger swelling with a ring gauge. We recruited 112 patients who took jidabokuippo and 134 patients who did not take jidabokuippo after surgery of the upper extremities. Postoperative finger swelling was evaluated using a ring gauge. The size difference between affected and unaffected fingers was measured. The mean time to remission of swelling after surgery for traumatic/non-traumatic disorders was 4.3/2.2 weeks in the jidabokuippo group and 7.2/3.4 weeks in the nonjidabokuippo group. Time was significantly shorter in the jidabokuippo group. The size difference between affected and unaffected fingers at 1, 2, 4, 8, 12 weeks after traumatic/non-traumatic surgery was 0.9, 0.4, 0.3, 0.1, 0.1/0.4, 0.3, 0.3, 0.2, and 0.1 respectively in the jidabokuippo group and 3.3, 3.0, 2.1, 1.2, 0.8/1.2, 0.8, 0.4, 0.2, and 0.2 in the non-jidabokuippo group. The jidabokuippo group had significantly more robust remission effect in finger swelling (P < 0.01)