：In this study, we investigated the greenery management of prefectural regional parks all over Japan in 2012, 8years after the introduction of a designated administration system, to understand how greenery of prefectural regional parks should be effectively managed under this system. Questionnaires were sent to 173 regional parks, and valid responses were obtained from 84 regional parks. According to the result, the followings were clarified. (1) The designated administrators including landscape/ gardening experts occupied 69.0% and those not including landscape/gardening experts occupied 31.0%. (2) The designated administrators including landscape/gardening experts gave a better promotion for collaboration with resident by using flowers management and collaboration in planning and conducting nature and environmental learning programs than those not including landscape/gardening experts. (3) According to greenery maintenance, it was revealed that the designated administrators including landscape/gardening experts were highly likely to make a mid-or long-term program, including landscape formation, and accumulated technical know-how on green maintenance. Keywords：designated administration system, regional parks, greenery management, maintenance of trees and woods, volunteer groups, resident participation キーワード：指定管理者制度，広域公園，植物管理，樹木・樹林管理，ボランティア団体，住民参画

No abstract