A mobile station UE according to the present invention comprising a gist thereof is to include, a measurement configuration acquisition unit 12 configured to acquire a measurement configuration for a second cell #2 frequency f2 from the radio base station eNB#A managing a first cell #1 by transmitting a measurement configuration request to the radio base station eNB#A managing the first cell, when it is determined that it is determined to desire to measure the second cell #2 using a frequency f2 different from a frequency f1 of the first cell #1 in communication and there is not held the measurement configuration for a second cell #2 frequency f2; and a measurement report transmission unit configured to transmit a measurement report including a reception quality in the second cell #2, to the radio base station eNB#A managing the first cell #1, in response to the received measurement configuration for a second cell #2 frequency f2.