In order to support the transmission of uplink control information adequately even when shortened TTIs are used, a user terminal according to one aspect of the present invention has a transmitting section that transmits uplink control information by using a shortened TTI, in which a length of a transmission time interval (TTI) is shorter than 1 ms, and a control section that controls transmission of the uplink control information by using a given uplink control channel format for the shortened TTI, based on the number of bits of uplink control information transmitted in the shortened TTI.