An electrical connector (100) for electrically connecting a central processing unit to a printed circuit board, including a rectangular insulative housing (40) having a plurality of receiving channels; a number of contacts received in the receiving channels; a cover (10) rotatably covering on the insulative housing so as to press the central processing unit; a lever (50) comprising an operating portion (504) and two pressing portions (503) to lock the cover; and a stiffening frame positioned under the insulative housing. Wherein said stiffening frame is formed with a first and second stiffening plates (30,31) and two stiffening beams (20), each stiffening beam has two engaging portions (212) extending longitudinally, each stiffening plate comprises a first and a second fixing plates (301,311) on two sides thereof to fix the engaging portions transversely to form a frame structure. The stiffening frame is formed by joint to avoid wasting the material of the central as the stiffening frame is formed by punching an integrated metal plate.