Abstract: The present invention relates to a handle post mounting device for a tractor having a hood and a bonnet comprising a central wall having a projected portion formed at the central part thereof toward a backward direction to be engaged with the hood through sealing rubbers on the outer peripheral edge thereof and mounted on body frames at the rear of the bonnet for mounting a handle post therethrough. Thus, hot air flowed from the vicinity of the rear of a bonnet and the right and left sides backwardly can be blocked by the central wall mounted on a body frame and a hood engaged via sealing rubbers with the outer peripheral edge of the wall, thereby improving the residential environment in the vicinity of a driver's seat and obviating the complexity of closing the periphery of a handle post by a complicated conventional blocking plate.