Thin plug connector and assembly method thereof

A thin plug connector, comprising:

• an insulator body including a tongue plate, a pair of holding portions, and a plurality of grooves on said tongue plate, said pair of holding portions being disposed on two opposite sides of said tongue plate;
• a plurality of terminals disposed on said insulator body in said grooves, each of said terminals including a contact portion and a soldering portion, said contact portion being disposed on said tongue plate;
• and
• a metallic casing for accommodating said insulator body, said metallic casing having a first opening, a first side plate, a second side plate opposite to said first side plate, and a connecting plate connecting said first and second side plates, said first opening permitting said tongue plate to extend out through said first opening to expose said contact portions of said terminals, said first and second side plates covering said insulator body and said soldering portions of said terminals, said connecting plate blocking said holding portions of said insulator body to restrict movement of said insulator body in a direction toward said first opening.