A radio communication system and a handover control method are provided that can reduce abnormal disconnections of communication attributable to handover to from another cell an own cell. Provided are a handover suppression section (102) that, when receiving from a base station (30A) managing a first cell (35A) a request for handover to a second cell (35B), suppresses the handover in accordance with the degree of handover suppression, a handover failure detection section (13) that detects a handover failure caused by the handover suppression, and a handover suppression optimization section (203) that adjusts the degree of handover suppression based on the rate of handover failure occurrence.