A user apparatus includes a transmission unit configured to transmit sidelink data based on information for sidelink scheduling received from a base station apparatus; and a reception unit configured to receive feedback information with respect to the sidelink data from a user apparatus that has received the sidelink data, wherein the transmission unit transmits to the base station apparatus, based on a predetermined assumption, first HARQ-ACK information that is based on the feedback information, and second HARQ-ACK information with respect to data received by the reception unit from the base station apparatus.