1997 The 1st 3R international symposium October 13-17, Greenpia Miki, Miki City, Hyougo
1999 The 2nd 3R international symposium November 16-19 Greenpia Miki, Miki City, Hyougo
2001 The 3rd 3R international symposium November 6-9 Greenpia Miki, Miki City, Hyougo
2003 The 4th 3R international symposium November 9-13 Awaji Yumebutai International Conference Center
2005 The 5th 3R international symposium November 13-17 Awaji Yumebutai International Conference Center
2008 The 6th 3R international symposium October 27-30 Yamaha Tsumagoi Resort, Kakegawa City, Shizuoka
2010 The 7th 3R international symposium October 26-30 Toyama International Conference Center
2012 The 8th 3R international symposium November 25-28 Awaji Yumebutai International Conference Center
2014 The 9th 3R international symposium November 17-21 Gotenba Kogen Hotel, Gotenba City, Shizuoka
2016 The 10th 3R international symposium November 13-17 Hotel Ichibata, Matsue City, Shimane
2018 The 11th 3R+3C international symposium November 12-16 Kanazawa Bunka Hall, Kanazawa City, Ishikawa
(suspension by COVID-19 pandemic)
2024 The 12th 3R+3C international symposium November 18-22 ACROS Fukuoka, Fukuoka City, Fukuoka
2026（Confirmed plan)
The 12th 3R3C+D international symposium November 8-12 Nagasaki Brick Hall, Nagasaki City, Nagasaki