The president (limited to one term of three years), two vice-presidents and two auditors (one each from East Japan and West Japan, up to two terms), and 12 directors (six each from East Japan and West Japan, up to two terms), are elected by those attending the general meeting. In addition, several directors are nominated in consideration of the balance between districts and their research fields. The management tasks, including the editing and publication of Annals, are performed by 7 executive committee members including the president and both vice-presidents and those who are recommended by the directors.