| Akira Mitsuyasu | Director | 10 Jun 2005 | 1 May 2008 | Japanese | 77 years |
| Akira Takahashi | Director | 12 Apr 1995 | 13 Jan 1997 | Japanese | 76 years |
| Andrew Howard Trevor Pirie | Secretary | 24 Feb 1993 | 16 Apr 1993 | British | - |
| Dominic Walsh | Director | 7 Feb 2006 | 31 May 2021 | British | 59 years |
| Dominic Walsh | Secretary | 17 Jan 2005 | 31 May 2021 | British | - |
| Etsuro Nakanishi | Director | 18 Jun 1997 | 1 Feb 2001 | Japanese | 78 years |
| Hideaki Nagashima | Director | 1 May 2008 | 16 Apr 2014 | Japanese | 62 years |
| Hidenori Iguchi | Director | 16 Apr 2014 | 19 Apr 2016 | Japanese | 67 years |
| Hidenori Nomi | Director | 16 Apr 2014 | 1 May 2017 | Japanese | 58 years |
| Hideo Nakanishi | Director | 15 Feb 2007 | 1 Apr 2009 | Japanese | 68 years |
| Hiroshi Morita | Director | 19 May 2020 | 16 Dec 2021 | Japanese | 59 years |
| Hiroshi Oka | Director | 15 May 2007 | 27 Apr 2010 | Japanese | 66 years |
| Hiroyuki Akahori | Director | 1 Apr 2017 | 19 May 2020 | Japanese | 58 years |
| Hiroyuki Tomosada | Director | 1 Apr 2009 | 16 Mar 2011 | Japanese | 66 years |
| John Joseph Vareldzis | Director | 1 Jul 2002 | 17 Aug 2004 | British | 54 years |
| John Patrick Manley | Director | 24 Feb 1993 | 28 Jun 2002 | British | 79 years |
| John Richard Stone | Director | 7 Feb 2006 | 15 Mar 2006 | British | 74 years |
| Junni Miyake | Director | 20 Jul 1999 | 25 Jun 2002 | Japanese | 80 years |
| Kazuhiro Tatematsu | Director | 1 Apr 2019 | 31 May 2021 | Japanese | 62 years |
| Kenji Abe | Director | 13 Jan 1997 | 5 Jul 2004 | Japanese | 75 years |
| Kunio Tajiri | Director | 16 Apr 1993 | 16 Jun 1993 | British | 84 years |
| London Law Secretarial Limited | Corporate Nominee Secretary | 20 Jan 1993 | 24 Feb 1993 | United Kingdom | - |
| London Law Services Limited | Corporate Nominee Director | 20 Jan 1993 | 24 Feb 1993 | United Kingdom | - |
| Mamoru Horita | Director | 15 Sept 1993 | 1 Nov 1997 | Japanese | 76 years |
| Michael Alastair George Nicholson | Director | 20 Jul 1999 | 30 Sept 2003 | British | 75 years |
| Michael Alastair George Nicholson | Director | 1 Dec 2004 | 17 Jul 2008 | British | 75 years |
| Mitsuru Umino | Director | 19 Apr 2016 | 1 Apr 2019 | Japanese | 60 years |
| Mitsutaka Ishida | Director | 1 May 2017 | 1 Sept 2020 | Japanese | 58 years |
| Motonari Shimizu | Director | 16 Mar 2011 | 19 Apr 2016 | Japanese | 64 years |
| Nigel John Lugg | Director | 15 Sept 1993 | 31 Mar 2019 | British | 70 years |
| Roy Barnes | Director | 16 Apr 1993 | 31 Jan 1997 | British | 90 years |
| Roy Barnes | Secretary | 16 Apr 1993 | 2 Jan 1997 | British | - |
| Ryoichi Ichihara | Director | 19 Apr 2016 | 28 Mar 2022 | Japanese | 60 years |
| Sarah Shannon | Director | 31 May 2021 | 28 Mar 2022 | British | 50 years |
| Satochi Tabuchi | Director | 1 Apr 2009 | 16 Mar 2011 | Japanese | 64 years |
| Shimizu Motonari | Director | 20 Feb 2001 | 10 Jun 2005 | Japanese | 64 years |
| Shoji Miura | Director | 27 Apr 2010 | 1 Apr 2013 | Japanese | 63 years |
| Shuhei Yamamoto | Director | 1 Apr 2013 | 16 Apr 2014 | Japanese | 67 years |
| Stephanie Aline Theodora Samson | Director | 7 Feb 2006 | 15 Mar 2006 | French | 54 years |
| Stephen Rainford | Director | 1 Feb 1997 | 7 Jan 2005 | British | 67 years |
| Stephen Rainford | Secretary | 2 Jan 1997 | 7 Jan 2005 | British | - |
| Tadashi Yanagisawa | Director | 16 Apr 1993 | 15 Sept 1993 | Japanese | 81 years |
| Takeo Maruyama | Director | 16 Jun 1993 | 18 Jun 1996 | British | 87 years |
| Takeshi Takahashi | Director | 18 Jun 1996 | 28 May 1999 | Japanese | 85 years |
| Teiji Miyamoto | Director | 16 Apr 1993 | 1 Mar 1994 | British | 84 years |
| Tomio Hosoi | Director | 10 Jun 2005 | 15 May 2007 | Japanese | 70 years |
| Toru Hiroe | Director | 15 May 2007 | 1 Apr 2009 | Japanese | 67 years |
| Toshio Konishi | Director | 24 Nov 1993 | 12 Apr 1995 | Japanese | 81 years |
| Toshiya Katsuki | Director | 10 Jun 2005 | 15 May 2007 | Japan | 62 years |
| Yoshsfumi Nomori | Director | 25 Jun 2002 | 10 Jun 2005 | Japanese | 78 years |
| Yuzo Toyama | Director | 23 Mar 1994 | 28 May 1999 | Japanese | 78 years |