a steering apparatus for a front wheel drive tractor comprising , at each of opposite lateral sides thereof , a front axle , a front axle case housing the front axle , a kingpin , a transmission case provided in an outer end region of the front axle case to be pivotable about the kingpin , and a front wheel attached to the transmission case and including a hub shaft . the kingpin is operatively connected to the front axle through a bevel gear transmission , and the hub shaft is operatively connected to the kingpin through a bevel gear transmission and a planetary reduction mechanism . the front wheel has a substantially zero camber angle , and the kingpin is inclined such that a lower portion of the transmission case disposed inwardly with respect to a center of the tractor is substantially contained inside a rim of the front wheel .