The present design is easily adjusted significantly improve convenience while the height of the driver's seat sitting in the driver's seat, reducing the driver's visibility is confirmed as the seat cushion height adjustment is the adjustment of the stage once completed, the height setting of the cockpit to the progress of time and effort It was directed to a driver's seat adjuster to give. The subject innovation, the adjuster of the driver's seat is configured to include gives bathyeo the driver's seat the seat cushion is coupled to the prime mover eoga one end to operate the height adjustment device is provided with a driven gear shaft support bearing to the frame for realizing this, in one end it is coupled to the prime mover eoga the shaft portion is provided with a lever gear to the other end integral with the; Lever The lever claws which are selectively engaged with the gear is formed to project to both sides are hinged to the casing on which the hinge point is formed toward the other additional blood pressure, the inclined arrangement with respect to said shaft; An elastic member for elastic supporting the gear lever so that one claw is disposed in close contact with the lever gear inclination of the lever; The receiving direction, and an elastic member around the patient is hinged to the casing to change the direction of rotation of the lever gear by switching the inclination direction of the elastic member and the lever; And installing accommodate the components, the casing being a handle for operating the said lever: characterized by configured to include.