An electrical connector (100) for electrically connecting a substrate (4) to a printed circuit board (5) comprises an insulative housing (2) and a plurality of contacts (3) arranged in matrix. The insulative housing defines a receiving slot (21) extending along a front-to-back direction from front surface thereof, a plurality of rows of through passages (23) arranged along a lateral direction of the insulative housing and each through passage extending substantially along an angular axis of both the front-to-back direction and lateral direction to communicate with the receiving slot. Through passages of the same row are spaced arranged along the front-to-back direction. The matrix of contacts is respectively arranged in said through passages of the insulative housing in an interference capacity with said receiving slot. Each contact comprises an upper compliant connecting portion (32) protruding into the receiving slot adapted for being compressed by said substrate to form electrical connection, a middle supporting portion (30, 33) received in the through passage to retain the contact in the insulative housing and a lower elastic connecting portion (31) exposed beyond corresponding through passage adapted for electrically connecting to said printed circuit board.