An electrical connector includes an insulative housing and a plurality of contacts. The insulative housing defines a mating face, a mounting face opposite to the mating face and a plurality of receiving passageways running through the mating face and the mounting face. The contacts are assembled in the receiving passageways and each contact include a base portion, a pair of retaining portions extending from two opposite ends of the base portion, a pair of elastic arms extending from the retaining portions, a soldering portion extending out of the receiving passageways and a connecting portion connecting the soldering portion and the base portion. Each receiving passageway protrudes a tuber from a first inner face thereof. Free ends of the retaining portions are located at two sides of the tuber and engage with the first inner face of the receiving passageway. The tuber is spaced from the two retaining portions at two sides of the tuber. A pair of tabs defined at a free end of the tuber press against the pair of retaining portions to form a pair of receiving grooves between the two sides of the tuber and the retaining portions.