An electrical connector includes an insulative housing, a plurality of contacts and an actuator. The insulative housing defines a front opening and a back receiving space. The receiving space defines a horizontal plane and a vertical plane connecting each other. The contacts include retaining portions, contacting portions and pressing portions. Each contacting portion and corresponding pressing portion extends oppositely from the retained portion. The actuator includes a base portion and several separate costal parts extending from the base portion. Adjacent costal parts are connected by a shaft and the pressing portions are against to the shaft. The actuator rotates around the shaft and defines a cambered surface at the costal parts, the cambered surface slides between the horizontal plane and the vertical plane.