Director of the Preparatory Office
1986/7 ~ 1987/8
Director of the Preparatory Office
1987/7 ~ 1988/12
Director of the Preparatory Office
1989/1 ~ 1989/12
Acting Director of the Preparatory Office
1989/10 ~ 1989/11,1991/1 ~ 1991/9,1994/2 ~ 1995/2
Acting Director of the Preparatory Office
1989/11 ~ 1989/12
Director of the Preparatory Office
1990/1 ~ 1990/12
Director
1991/9 ~ 1994/1
Director
1995/2 ~ 2004/2
Director
2004/2 ~ 2013/2
Director
2013/2 ~ 2019/2
Acting Director
2019/2 ~ 2020/6
Acting Director
2020/7/1 ~ 2020/7/26
Director
2020/7/27 ~