Electrical connector assembly

An electrical connector assembly for connecting a cable, comprising:

• a cable connector having a first terminal to be connected to the cable;
• a receptacle connector having a second terminal for electrically contacting with the first terminal, said receptacle connector further having a recessed portion for accommodating a substantially entire portion of the cable connector so that the receptacle connector is connected to the cable connector in a first direction;
• a locking protruding portion disposed on one of the cable connector and the receptacle connector, said locking protruding portion having a first length in a second direction perpendicular to the first direction;
• and
• a locking groove portion disposed in the other of the cable connector and the receptacle connector, said locking groove portion having a second distance in the second direction smaller than the first length so that the locking protruding portion can be inserted into the locking groove portion only in an inclined state.