Legally, specified persons are not allowed to privately use port facilities (wharfs and the like) as public facilities. However, at the present time marine transport competition is intensifying internationally so public facilities, which are efficient and with new management methods are in keen demand. The concept of "public" becomes a problem. On the subject of the maximum permissible limit of exclusive use for public facilities, I would like to introduce the trend of recent port administration and from there examine the possibility of taking a step forward.