A mobile station UE according to the present invention includes: a determination unit 14 configured to determine whether to notify a measurement result based on the radio quality in the serving cell and the neighboring cell measured by the measurement unit 13, and the parameter acquired by the parameter acquisition unit 12; and a notification unit 15 configured to notify the radio base station eNB of the measurement result when the determination unit 14 determines that the measurement result is to be transmitted, in which only when a first predetermined period or more has elapsed after the mobile station UE starts to communicate with the serving cell, the determination unit 14 is configured to determine whether to notify the measurement result.