To move a work table in all directions and to expand the work range by installing an expansion mast expandable in the vertical direction on a swivel base provided on a vehicle body via a rotary disk, and providing the work table on a jib arm provided on the expansion mast tiltably in the vertical direction.

This work vehicle can apply three kinds of actions: a turning action by a turn table 5, a vertical action by a three-stage expansion mast 11, and a vertical action by the vertical tilt of a jib mechanism 21 and a horizontal action (reach action) in the longitudinal direction, to a work table 31 in the stopped state of a vehicle body 1. The work table 31 can be moved to an optional position in all directions by properly combining these actions, and the high lift of the work table 31 is secured by two actions of the vertical action by the expansion mast 11 and the vertical action by the jib mechanism 21, thereby the work range is largely expanded.