There is provided a communication device including: a high frequency coupler; a band-pass filter; a switching mechanism that switches an electrical length a transmission line between the high frequency coupler and the band-pass filter; a communication unit that receives hardware information of other end of communication before establishing a communication connection; and a control unit that controls switching of the electrical length of the transmission line according to the received hardware information of the other end of communication by using the switching mechanism with or after establishing a communication connection.