Disclosed is a cabin of a tractor, covering a driver′s seat of the tractor to protect the driver′s seat. According to an embodiment of the present invention, the cabin of the tractor comprises: an upper frame; a front wiring bracket; a rear wiring bracket; an inner roof; and an outer roof. The upper frame has a section with an angulated shape. The front wiring bracket and the rear wiring bracket are installed on the upper surfaces of the front upper frame and the rear upper frame of the upper frame. The inner roof is fixedly placed on the wiring brackets and the upper frame. The outer roof covers the inner roof. Working lights are installed on the front sides and rear sides of the front upper frame and the rear upper frame, respectively. Multiple power cables that supply power to the work lights pass through the wire brackets and are drawn out from the inside of the inner roof to each front side and rear side of the cabin to be connected to the work lights.