[Object] To provide a mechanism of carrier sense considering the influence of not only the own network but also other networks in a wireless communication system.[Solution] Provided is a terminal device, including: a wireless communication unit that performs communication with a base station that forms a first wireless network; a carrier sense unit that performs carrier sense with another device; and a control unit that controls a signal detection threshold so that another terminal device belonging to a second wireless network different from the first wireless network is outside a signal detection range, based on a carrier sense result by the carrier sense unit.