Connector and connector assembly

A connector, comprising:

• a first flexible wiring board including a first signal wiring and a first ground conductor;
• a second flexible wiring board including a second signal wiring and a second ground conductor;
• a plate-shaped ground plate, which is provided between the first flexible wiring board and the second flexible wiring board, and includes first contact portions which are brought into contact with each of the first ground conductor and the second ground conductor;
• and
• a first insulator forming an accommodation space for holding the first flexible wiring board, the second flexible wiring board, and the ground plate,
• wherein the first insulator forms the accommodation space so as to cover at least a part of each of five portions including distal end portions, both side end portions, and two main surface portions, which face outward, of a whole of the first flexible wiring board, the second flexible wiring board, and the ground plate, and holds the ground plate under a pressing state,
• wherein a portion of each of the first signal wiring and the second signal wiring is exposed to an outside of the first insulator, and
• wherein a portion of at least one side end portion of the ground plate is exposed to the outside of the first insulator.