Fair distribution of burdens mitigates the dissatisfaction of accepting it. Although much of the literature referred to individual decision-making, few studies have focused on the group decisions reached through discussions and their evaluations. This study aims to examine the effects of fair burden distribution on the outcomes of discussions through a group decision experiment. Participants in the experiment were Japanese university students. The discussion subject was the final disposal of removed soil outside of Fukushima, caused by the nuclear power plant accident. The decontamination works were conducted to recover the environment, and they generated a huge volume of the removed soil, which is stored in a facility in Okuma and Futaba towns, Fukushima. By law, the Government must complete the final disposal of the removed soil outside of Fukushima by 2045. To reduce the amount to be disposed of, recycling low-concentration soil as construction material is vital. A key factor influencing the acceptance of the removed soil is burden-sharing. In the experiment, we manipulated the candidate site numbers. In the single-site condition, participants were informed that only their residential area was selected as a candidate site. Conversely, in the multiple-site condition, participants were told that multiple areas, other than their own, were also selected as candidate sites. Participants were asked to decide as a group whether to accept the removed soil. The results revealed no significant difference in the number of groups that decided to accept the removed soil in their residential area. However, contrary to expectations, participants in the single-site condition felt more burden-sharing towards the decisions than in the multiple-site condition. These findings indicated that a fair burden distribution affects the evaluation of the decisions, despite coming from the same outcomes on the surface. This study could contribute to designing the site selection procedure of unwanted facilities.