1 August 2026Appointed Watanabe, Kensei as Director
1 August 2026Resigned Okahata, Yoshinori as Director
1 April 2025Appointed Yanagi, Tetsuo as Director
1 April 2025Resigned Harada, Yasushi as Director
1 April 2025Appointed Okahata, Yoshinori as Director
1 April 2025Resigned Taguchi, Takanori as Director
1 April 2024Appointed Yokokawa, Kazumitsu as Director
1 April 2024Resigned Azuma, Eiji as Director
1 April 2023Resigned Yamaguchi, Takao as Director
1 April 2023Appointed Azuma, Eiji as Director
1 April 2023Appointed Taguchi, Takanori as Director
14 November 2022Resigned Hamada, Hirotaka as Director
14 November 2022Appointed Sakamoto, Naoki as Director
1 April 2022Resigned Sakakihara, Daishi as Director
1 April 2022Appointed Yamaguchi, Takao as Director
15 September 2021Appointed Harada, Yasushi as Director
1 April 2021Appointed Sakakihara, Daishi as Director
1 April 2021Appointed Hamada, Hirotaka as Director
1 April 2021Resigned Sasaki, Yoshihide as Director
1 April 2021Resigned Sako, Naohiro as Director
1 April 2021Resigned Yokoyama, Kenji as Director
1 April 2021Appointed Yokoyama, Yoichi as Director
16 November 2017Resigned Motozawa, Keiko as Secretary
1 July 2017Resigned Isaji, Yoshio as Director
1 July 2017Appointed Sasaki, Yoshihide as Director
1 April 2017Resigned Ueda, Hajime as Director
1 April 2017Appointed Sako, Naohiro as Director
1 April 2016Appointed Ueda, Hajime as Director
1 April 2016Resigned Saito, Harumi as Director
1 April 2015Resigned Okai, Yasuki as Director
1 April 2015Resigned Hashimoto, Koji as Director
1 April 2015Appointed Saito, Harumi as Director
1 April 2015Appointed Isaji, Yoshio as Director
1 April 2013Appointed Yokoyama, Kenji as Director
1 April 2013Resigned Mitsugi, Yoshihito as Director
1 April 2012Appointed Hashimoto, Koji as Director
1 April 2012Appointed Motozawa, Keiko as Secretary
1 April 2012Resigned Igarashi, Fumio as Director
1 April 2011Appointed Mitsugi, Yoshihito as Director
1 April 2011Resigned Hirota, Shigeru as Director
1 April 2010Appointed Igarashi, Fumio as Director
1 April 2010Resigned Kondo, Tetsuo as Director
1 April 2010Appointed Okai, Yasuki as Director
1 April 2010Resigned Kusunoki, Shin as Director
1 April 2009Resigned Muroi, Masahiro as Director
1 May 2007Resigned Katayama, Ken as Director
1 April 2007Resigned Saito, Harumi as Director
1 April 2007Appointed Kondo, Tetsuo as Director
1 April 2007Appointed Kusunoki, Shin as Director
1 April 2007Resigned Okuda, Hitoshi as Director
1 April 2007Appointed Hirota, Shigeru as Director
1 October 2006Resigned Araki, Naohiko as Director
1 October 2006Appointed Muroi, Masahiro as Director
1 April 2006Resigned Yakabe, Takashi as Director
1 April 2006Appointed Okuda, Hitoshi as Director
1 April 2005Appointed Yakabe, Takashi as Director
31 March 2005Resigned Kayo, Hisao as Director
28 February 2005Resigned Azuma, Eiji as Director
16 August 2004Appointed Katayama, Ken as Director
16 August 2004Resigned Mishima, Naoto as Director
1 May 2004Appointed Azuma, Eiji as Director
1 May 2004Appointed Saito, Harumi as Director
1 May 2004Appointed Kayo, Hisao as Director
1 May 2004Appointed Araki, Naohiko as Director
1 May 2004Appointed Mishima, Naoto as Director
30 April 2004Resigned Oyama, Shozo as Director
30 April 2004Resigned Umeda, Jun as Director
30 April 2004Resigned Suenaga, Mamoru as Director
30 April 2004Resigned Imai, Hisashi as Director
30 April 2004Resigned Yakabe, Takashi as Director
1 August 2003Resigned O Yama, Shozo as Secretary
4 July 2003Appointed O Yama, Shozo as Secretary
4 July 2003Resigned Suzuura, Hiroki as Secretary
1 April 2003Appointed Yakabe, Takashi as Director
31 March 2003Resigned Okoshi, Tatsufumi as Director
31 March 2003Resigned Kimura, Atsushi as Director
1 April 2002Appointed Suenaga, Mamoru as Director
31 March 2002Resigned Fujinuma, Akihisa as Director
31 March 2002Resigned Fukushima, Kiyohiko as Director
30 May 2001Appointed Okoshi, Tatsufumi as Director
29 May 2001Resigned Nishizawa, Takashi as Director
1 April 2001Appointed Imai, Hisashi as Director
31 March 2001Resigned Asaoka, Yasuchika as Director
19 March 2001Resigned Nakazato, Tetsuya as Secretary
19 March 2001Appointed Suzuura, Hiroki as Secretary
28 April 2000Resigned Okuda, Hitoshi as Director
28 April 2000Appointed Umeda, Jun as Director
28 April 2000Appointed Fujinuma, Akihisa as Director
28 April 2000Resigned Takeuchi, Shin as Director
28 April 2000Appointed Asaoka, Yasuchika as Director
30 June 1999Appointed Fukushima, Kiyohiko as Director
30 June 1999Resigned Watabe, Ryo as Director
4 December 1998Appointed Kimura, Atsushi as Director
4 December 1998Resigned Moriya, Satoshi as Director
4 December 1998Appointed Nakazato, Tetsuya as Secretary
4 December 1998Resigned Nakamura, Yoichi as Secretary
12 June 1998Appointed Moriya, Satoshi as Director
12 June 1998Resigned Wako, Juichi as Director
12 June 1998Appointed Nishizawa, Takashi as Director
12 June 1998Resigned Hirayama, Shinobu as Director
12 June 1998Appointed Oyama, Shozo as Director
14 July 1997Appointed Wako, Juichi as Director
20 June 1997Resigned Ohno, Ken as Director
20 June 1997Appointed Takeuchi, Shin as Director
31 March 1997Resigned Seo, Shuichi as Director
30 December 1996Appointed Hirayama, Shinobu as Director
30 December 1996Appointed Seo, Shuichi as Director
30 December 1996Resigned Kamata, Yoshihiko as Director
13 June 1996Appointed Ohno, Ken as Director
13 June 1996Appointed Okuda, Hitoshi as Director
13 June 1996Resigned Ota, Kiyochika as Director
13 June 1996Appointed Nakamura, Yoichi as Secretary
13 June 1996Resigned Yoshikawa, Akira as Secretary
5 February 1996Resigned Nagata, Shigenori as Director
16 June 1995Appointed Kamata, Yoshihiko as Director
16 June 1995Resigned Ogiwara, Yo as Director
27 April 1995Resigned Ishibashi, Shozo as Director
27 April 1995Appointed Ogiwara, Yo as Director
15 December 1993Resigned Imagawa, Seishu as Secretary
15 December 1993Appointed Yoshikawa, Akira as Secretary
7 June 1993Appointed Imagawa, Seishu as Secretary
7 June 1993Appointed Watabe, Ryo as Director
7 June 1993Resigned Nagata, Shigenori as Secretary
7 June 1993Resigned Tamao, Toyomitsu as Director
22 June 1992Resigned Minaguchi, Koichi as Director
22 June 1992Resigned Yasuoka, Akira as Director
22 June 1992Appointed Ishibashi, Shozo as Director
16 July 1991Appointed Tamao, Toyomitsu as Director
16 July 1991Appointed Nagata, Shigenori as Secretary