A conductor assembly structure for a rail-type terminal device includes a conductor assembly and an insulating housing. The conductor assembly structure can reduce manufacturing waste and has a larger contact surface and a better electric conduction effect. The conductor assembly has a base portion that can be pivotally connected with a conductive connector, and a first area and a second area connected to the base portion. The first area and the second area are respectively formed with a bowed portion and a first section and a second section connected to the bowed portion to be snapped onto a grounding mounting rail. At least one of the first area and the second area is provided with a load arm and an elastic member connected to the load arm for increasing the elastic fixing effect (force) of the first section and/or the second section on the grounding mounting rail.