An integrated circuit device includes: first through fourth terminals arranged in order in which the first terminal and the fourth terminal are arranged in line symmetry with respect to a center axis of the first through fourth terminals, and the second terminal and the third terminal are arranged in line symmetry with respect to the center axis; a first receiving circuit coupled to the first and second terminals, the first receiving circuit receiving one of a first differential signal pair and a second differential signal pair; a second receiving circuit coupled to the third and fourth terminals, the second receiving circuit receiving the first differential signal pair when the first receiving circuit receives the second differential signal pair and the second differential signal pair when the first receiving circuit receives the first differential signal pair; a first selector selecting one of a first signal and a second signal obtained by inverting the first signal that are output from the first receiving circuit based on a select signal; a second selector selecting one of a third signal and a fourth signal obtained by inverting the third signal output from the second receiving circuit based on the select signal; and a third selector outputting each output of the first and second selectors by switching each output to a first output line and a second output line based on the select signal.