This study aims to demonstrate the significance of discussion under the “veil of ignorance” in building consensus about the Not In My Back Yard (NIMBY) issue. The Siting for a Contaminated Waste Landfill Game simu-lates conflicts related to the site selection of a contaminated waste landfill created by the accident at Fukushima nuclear power plant. It was developed with the veil of ignorance implemented as the prevailing social structure. The game involves two types of players: mayors, who are aware of the interests of their regions but can only engage in discussion; and citizens, who are un-aware of the specific concerns of their regions (i.e., under the veil of igno-rance) but are tasked with engaging in discussions and making the final deci-sion. The transformations of the ideas of the players were examined through this game relating to building consensus. Ten games were conducted, and no unfair decisions were discerned under the veil of ignorance. A qualitative analysis of the open-ended questions revealed that a) the participants fo-cused on fair viewpoints and avoided fixating on their regional interests after the discussion, and b) emphasized the importance of including a variety of perspectives before and after the discussion. Hence, this study succeeded in demonstrating that by participating in discussions under the veil of igno-rance, participants were able to form a shared recognition of the multiple-decision process on the NIMBY issue.