Connector

A connector to be mated with a mating connector along a mating direction, wherein:

• the connector comprises a plurality of pairs of signal contacts, a plurality of ground contacts and a holder which holds the pairs of the signal contacts and the ground contacts;
• each of the signal contacts and the ground contacts includes a contact portion to be connected with the mating connector;
• in a predetermined plane perpendicular to the mating direction, the contact portions of the signal contacts and the contact portions of the ground contacts are grouped and arranged into a first line and a second line;
• in the predetermined plane, four specific signal contact portions are surrounded by four specific ground contact portions, the four specific signal contact portions being the contact portions of the signal contacts constituting two of the pairs, the four specific ground contact portions being two of the contact portions of the ground contacts belonging to the first line and two of the contact portions of the ground contacts belonging to the second line;
• and
• in the predetermined plane, a minimum distance between two of the specific ground contact portions is smaller than another minimum distance between one of the specific signal contact portions and one of the contact portions of the signal contacts other than the specific signal contact portions.