An electrical connector is provided to have a watertight function and a portion on its rear side downsized. The electrical connector includes an insulating housing, conductive contacts held by the housing, and a shell for containing the housing. The conductive contacts each include a connection portion exposed on the front side of the housing to connect to a mating contact of a mating connector, and a terminal portion protruding rearward from the housing. The shell includes a front shell member and a rear shell member provided in the rear of the front shell member. The front shell member has a fitting portion open to the front into which the mating connector is insertable. The rear shell member has a smaller diameter than the front shell member. A space between the housing and a constriction portion is tightly sealed.