<p>Japan hosted the Rugby World Cup (hereinafter called "RWC") in the autumn of 2019, which brought about the biggest economic impact in RWC history. International Sport events require an ex post facto evaluation from multiple perspectives. What were the effects on regional developments?(I think that this google translate of your Japanese abstract is a better sentence; So how did the event lead to regional development?)</p><p>The effects of international sporting events are mainly divided into economic effects and social effects. The economic impact was already disclosed by the RWC 2019 Organizing Committee. The purpose of this paper is to elucidate the social impact that the RWC brought to the 12 venues in the eyes of host municipalities and persons in charge of RWC at the regional rugby organizations. Fifteen people from the venues and 12 people from the regional rugby associations in charge of the RWC were interviewed. Before hosting a future international event is considered, a ex post facto evaluation of the current event, while clarifying the results from a local perspective, has social as well as academic significance.</p><p>In regards to the social impact of the RWC on local communities, 13 categories of structured concepts were formed (maybe identified is better than formed?).Social impact on local communities include "evaluation on operations", "acquisition of local pride and confidence", "sense of unity and solidarity among residents", "awareness for international exchange", "contingency", "acquisition of knowhow of event operations", "increased volunteer activities", "improved local hospitality", sport related perceived impact include "increased popularity of rugby", "activation of local sport/rugby", "improved sports facilities". Characteristics of this event were "contribution to rebuilding after earthquakes" for Kamaishi city, Iwate Prefecture and Kumamoto city Kumamoto Prefecture, and "revitalization of children" through inviting elementary and junior high school children to watch games was also clarified.</p>