This study aimed to examine the effect of early childhood education advisor visits in Hiroshima Prefecture through a three-year long longitudinal study. The principal of the early childhood education facility and the nursery teachers answered a questionnaire before and after the visit of the early childhood education advisor. The results showed that the number of early childhood education facilities that used early childhood education advisor visits increased in three years. Additionally, early childhood education facilities that used advisor visits three or more times had various consultations. The early childhood education advisor visits were found to be effective to improve the quality of early care and education.