At the end of 2016, Basic Act on the Advancement of Public and Private Sector Data Utilization came into effect. Even before the law came into effect, the electronic administration open data strategy was formulated in 2012, and the disclosure of open data has been promoted by the national and local governments. Will the enactment of data utilization legislation affect the promotion of open data measures in local governments? This study confirms the influence of the plan formulation by confirming the formulation status of the “Plan for the Advancement of Public and Private Sector Data Utilization” for local governments that have already started open data.