To provide a slide door lock device of construction machinery capable of reducing and economizing a space.

A slide door lock device 6 of the construction machinery is equipped with an outer handle 7 provided to the outside of a slide door 1, an inner handle 8 provided to the inside thereof and a lock mechanism 9 operated by the handles 7 and 8. It is also equipped with an input rod 11 connected to the outer handle 7 side, an output rod 12 connected to the lock mechanism side 9, a middle plate connecting the input rod 11 and the output rod 12 and the inner handle 8 rotating the middle plate.