Electric connector having an excellent grounding function

An electric connector to be connected to a connection object having a first and a second surface opposite to each other in a first direction, said electric connector comprising:

• a plurality of primary ground contacts arranged in a second direction perpendicular to the first direction, each of the primary ground contacts having contact portions which are adapted for contacting with the first and the second surfaces of the connection object, respectively;
• a plurality of signal contacts arranged in the second direction, each of the signal contacts having a contact portion for contacting with the first surface of the connection object, adjacent two of the signal contacts being placed between adjacent two of the ground contacts;
• and
• a ground plate comprising a first supplementary ground contact facing a set of the adjacent two of the signal contacts in the first direction, the supplementary ground contact being adapted for contacting with the second surface of the connection object, and
• a connecting portion extending in the second direction, the connecting portion being formed integral with the first supplementary ground contact and electrically connected to at least one of the primary ground contacts.