A tractor in which a lift valve of a hydraulic system for lifting up/down a work machine is mechanically coupled to a lift lever, and conditions for an engine startup are set as follows: a reverser lever is at a neutral position thereof； a PTO (power take-off) clutch is disengaged； a seat switch is ON； and the lift lever is at a lowermost position thereof. A switch driving unit is provided on a side face of the lift lever so that the side face is orthogonal to a turning direction of the lift lever； a switch is provided so as to be opposed to the switch driving unit when the lift lever is turned to be at the lowermost position； and the lift lever at the lowermost position is detected by the switch.
