The present invention is designed to control retransmission properly in smaller units than TBs (for example, in units of CBs or in units of CBGs). According to one example of the present invention, a user terminal has a receiving section that receives a transport block (TB) including one or more codeblock groups (CBG), a transmission section that transmits retransmission control information that indicates an ACK or a NACK in response to each CBG, and a control section that, when at least one CBG in the TB is subject to retransmission, determines the number of bits of the retransmission control information based on the total number of CBGs in the TB or the number of CBGs that are retransmitted.