Abstract: A positioning mechanism is provided for accurately aligning an electrical connector (90) with a complementary connector. The positioning mechanism comprises a stationary base (3) having a number of rotatable elements mounted thereon (5), a stationary cover (1) defining an opening and having a pair of downwardly projecting positioning pins (13), an intermediate plate (2) adapted for mounting the electrical connector and defining a pair of through holes (21) for engaging with the positioning pins, and a pair of resilient elements (4) compressed between the intermediate plate and the base. When the electrical connector engages with the complementary connector, the intermediate plate moves downwardly against the resilient elements until a bottom surface of the intermediate plate touches the rotatable elements, and there exists a clearance between the positioning pin and the through hole for the intermediate plate to move upon the rotatable elements in a direction parallel to the cover.