An electrical connector comprises a housing having a front side and a rear side, a cage and a detection switch. The cage is engaged with the housing, the cage and the housing together define a slot, and an entrance of the slot is adjacent to the front side so as to allow an electronic card to enter into the slot along a card insertion direction. The detection switch is provided to the housing and comprises a first resilient terminal and a second resilient terminal. The second end portion is further adjacent to the front side relative and when the electronic card is received in the slot, the first resilient arm portion is separated from the second end portion.