A terminal portion configured to obtain electrical connection with a printed circuit board includes a first signal pad that is formed in a first conductor layer and is electrically separated from a ground layer, a pair of first ground pads that is formed in the first conductor layer to sandwich the first signal pad and is connected to the ground layer, a second signal pad that is formed in a second conductor layer and is connected to a signal line, a pair of second ground pads that is formed in the second conductor layer to sandwich the second signal pad and is electrically separated from the signal line, a third signal pad formed in a third conductor layer, and a pair of third ground pads formed in the third conductor layer to sandwich the third signal pad. The second signal pad is wider than the third signal pad.