A communication device is provided wherein a number of the pairs of transmission lines is N, each pair of the transmission lines comprises (N−1) stages of sub-transmission lines generating a same amount of crosstalk as that caused at a connector, and (N−1) stages of connecting portions comprise a transmission path of the connector and a first stage sub-transmission line, and (N−1) stages of the connecting portions to connect an i th stage sub-transmission line and an (i+1) th stage sub-transmission line by the straight/cross connection, and wherein each pair of the transmission lines is different in all pairs in a number of the connecting portion having the cross connection; and as a j th stage connecting portion in any one pair of the transmission lines has cross connection, a (N−j) th stage connecting portion in the any one pair of the transmission lines also has cross connection.