Abstract: A low-profile electrical connector mounted on a circuit board includes an insulating body. The insulating body includes a main body portion, a middle portion and a tongue plate. The main body portion has a slot concavely formed in a front end thereof, and at least one sidewall of the slot has a plurality of first terminal receiving grooves formed at intervals therein. The middle portion is formed by a bottom surface of the main body portion partially extending downwards. The tongue plate extends forwards from the middle portion and has a plurality of second terminal receiving grooves formed at intervals therein. A plurality of conductive terminals are respectively correspondingly received in the terminal receiving grooves. Comparing with conventional low-profile electrical connectors, the present invention can not only engage with various butting assemblies, but also save internal space of computers.