Patent ID: 8152539

Claim:
A differential transmission connector unit, comprising: a first differential transmission connector including a first electrically insulating block body, and a plurality of first signal contact pairs and at least one first ground contact arranged alternately in a row in the first electrically insulating block body; and a second differential transmission connector including a second electrically insulating block body, and a plurality of second signal contact pairs and at least one second ground contact arranged alternately in a row in the second electrically insulating block body, wherein the first differential transmission connector is connected to the second differential transmission connector with the first signal contact pairs and the second signal contact pairs being in contact with each other and the at least one first ground contact and the at least one second ground contact being in contact with each other, the first ground contact includes a first plate-like extension plate part and a first contact part at an end of the first extension plate part, the first contact part including a first contact surface, the second ground contact includes a second plate-like extension plate part and a second contact part at an end of the second extension plate part, the second contact part including a second contact surface, the first contact part of the first ground contact is formed with a step such that a terminal part of the first contact part is thinner than a part proximate to the first extension plate part to thereby form a space extending from the first extension plate part on a surface of the thinner terminal part, the surface of the thinner terminal part being the first contact surface, and the second contact part of the second ground contact is contained in the space, with the first contact surface of the first contact part and the second contact surface of the second contact part being in contact with each other.