An electrical connector comprises: a frame, a terminal set, and a base. The frame further comprises: a first receiving part, for receiving a first unit while allowing the first unit to be installed in a first direction; a second receiving part; a supporting part, for supporting and installing a circuitboard in the first direction; and a plurality of sockets, arranged in communication with the first receiving part; and a through penetration part, formed at a position between the first receiving part and the second receiving part. The terminal set includes a plurality of terminals, each formed with a first end and a second end, and each first end is inserted into its corresponding socket and protruding outside the supporting part, and each second end is disposed protruding into the first receiving part. The base is formed with a plurality of grooves for receiving the plural terminals in a one-by-one manner.