The Japan Society for Transplantation (JST) revised their guidelines in 2003 to specify that a living donor must be "a relative by blood within the sixth degree or an in-law within the third degree." Although several criticisms have been raised on this issue, these criteria have persisted without any empirical data showing the opinions and attitudes of people who are affected by the revision. Therefore, we performed a questionnaire survey to determine what Japanese medical professionals involved with living-donor liver transplantation (LDLT) regarded as eligible relationships for donation, as well as the kind of relationship for which they would be willing to donate their liver, and what donor eligibility criteria was currently used by their institutions. Among the 71 representatives of the Japanese Liver Transplantation Society, >90% answered that liver donations to emotionally close parents, siblings, children, or spouses were acceptable. However, the numbers were considerably lower for donation to emotionally close blood relatives, in-laws, friends, and strangers (78.2%, 52.1%, 18.6%, and 5.9%, respectively). This gap was more prominent when participants were questioned about their own willingness to donate. More than two-thirds of facilities that perform LDLTs have independent regulations for donor eligibility that are more conservative than the JST guidelines. No facility accepted friends or strangers as donors. When introducing policies or guidelines, it is important to carefully investigate the views of the people who are affected. The data obtained in this study should serve as a resource for ongoing discussions about the JST revised guidelines.