A wireless communication system comprises: first wireless base station apparatus that covers first cell; and second wireless base station apparatus that covers second cell that is wider than first cell and overlaps at least a portion of first cell, wherein: in a case of performing communication with mobile station terminal included in first cell, first wireless base station apparatus makes reference to communication quality of the second cell, judges whether or not wireless resource(s) of second wireless base station apparatus is to be reserved, and, when a judgment is made that reservation of wireless resource(s) is necessary, transmits wireless resource allocation request including necessary resource amount to second wireless base station apparatus; and in a case of receiving wireless resource allocation request from first wireless base station apparatus, second wireless base station apparatus allocates wireless resource(s) in accordance with necessary resource amount to first wireless base station apparatus.