An electrical connector is provided, which includes: a housing having a port and an opening; an insulating body having a tongue plate formed in the housing; a plurality of conductive terminals provided on the insulating body; and a seal body formed between the tongue plate and the port. The tongue plate protrudes from the port to a region outside of the housing, such that the housing is free from enclosing the tongue plate. A seal body is provided between the tongue plate and the port to seal off the port so as to be waterproofed, without increasing the contour size of the electrical connector.