A base station capable of appropriately transmitting a reference signal in an unlicensed band and a reception quality report measured using said reference signal. A control unit (102) of a base station (100) changes: the reference signal transmission timing which was set before carrier sensing on the basis of a time resource set according to carrier sensing results; and/or the report timing of the quality information measured in a terminal 200 using the reference signal. A transmission unit (108) and a receiving unit (109) communicate the reference signal or quality information on the basis of the changed timing.