A user terminal according to one aspect of the present invention includes: a transmission section that transmits a UL signal; and a control section that decides a number of sequences equal to or less than a defined overall number of sequences based on information and/or a sequence length notified from a base station, and controls the transmission of the UL signal to which a sequence number selected from the number of sequences has been applied. According to one aspect of the present invention, it is possible to appropriately control UL transmission even when a larger number of cell IDs is configured to a radio communication system than to existing LTE systems.