To provide a base station apparatus, a terminal apparatus, and a communication method for achieving a high frequency efficiency while coexisting with other radio access system under environment where multiple frame formats are multiplexed for use. A base station apparatus according to the present invention comprises a receiver that performs carrier sense on the second frequency band based on a predetermined frame configuration among a plurality of frame configurations to obtain the second frequency band during a predetermined duration, and a transmitter that notifies control information concerning the predetermined frame configuration and transmits a downlink signal to the terminal apparatus during the predetermined duration based on the predetermined frame configuration.