An electrical connector for electrically connecting an IC package to a printed circuit board is provided, which includes an insulative housing including a main body for supporting the IC package and four straight peripheral sidewalls surrounding the main body; a stiffener having a base separably disposed around the insulative housing. The base defines an opening for receiving the insulative housing. And the stiffener further includes four elastic latches extending upwardly from inner sides of the opening for engaging with the insulative housing, and the insulative housing corresponding defines four slots on outside surfaces of the sidewalls for being resisting against the elastic latches.