A terminal structure of a ZIF (Zero Insertion Force) electrical connector includes a U-shaped main body, two first plates and two second plates. The U-shaped main body has two side plate surfaces facing each other with a gap formed therebetween. The first plates are disposed at a top front section of the U-shaped main body and face each other with a first gap formed therebetween. The second plates are disposed at a top rear section of the U-shaped main body and face each other with a second gap formed therebetween, and the second gap is smaller than the first gap.