TRAVELING TRANSMISSION DEVICE OF TRACTOR

Provided are a speed changer device (18), a forward/reverse switchover device (19) for converting output of the speed changer device (18) into forward traveling power and reverse traveling power, a rear wheel differential mechanism (20) for inputting output of the forward/reverse switchover device (19) and transmitting it to rear wheels (7), and a gear transmission mechanism (95) for transmitting power of an output shaft (91) of the forward/reverse switchover device (19) to an input shaft (20a) of the rear wheel differential mechanism (20). A transmission case (3) is separable into a front case portion (3A) accommodating the speed changer device (18) and a rear case portion (3B) accommodating the forward/reverse switchover device (19), the rear wheel differential mechanism (20) and the gear transmission mechanism (95). The gear transmission mechanism (95) is detachably provided at a portion of the inside of the transmission case (3) which portion corresponds to a front end portion (3C) of the rear case portion (3B).