A wiring terminal structure of the present invention includes a box and a plugging element. The box is an integrally formed unitary unit and includes an upper wall, side walls, a lower wall, a hole, and a leaf spring. The upper wall, the side walls, and the lower wall define a space. The hole is formed on the upper wall and enables communication between the space and the outside of the box. The leaf spring extends upward from the lower wall to reach the space and forms an end protruding from the hole. The plugging element includes a plugging portion and a clamping portion having upper and lower clamping leaf springs. The plugging portion is inserted into the space and plugged into the box. The end of the leaf spring abuts against the plugging portion and is pressed downward by the plugging portion to lie in the space.