To provide a roll rod structure of a vehicle that efficiently supports power train displacement to insulate vibration, prevents a rear insulator from being worn or damaged, and thereby improves durability.

The roll rod structure of a vehicle is provided in a sub-frame of the vehicle, and is connected to a transmission or an engine. The roll rod structure includes: a fastening rod with one side connected to the transmission or the engine, and the other side having a slide part inserted into the sub-frame; a mounting member fixed to the sub-frame, connected to an outer circumferential surface of the slide part, and having a protrusion formed on the inner circumferential part; a front insulator connected to the outer circumferential surface of the slide part and located in front of the protrusion; a rear insulator connected to the outer circumferential surface of the slide part and located behind the protrusion; and an end plate mounted on the fastening rod behind the rear insulator.