To provide a cab-tilt device in which a necessary stroke of a cylinder device to tilt a cab forward to a prescribed angle can be reduced.

A hinge bracket 2 near the front end of a chassis 1 and a hinge bracket 4 on the side of a cab 3 so as to be placed backward against the hinge bracket 2 are provided. The hinge brackets 2 and 4 are connected by a link lever 5 swingable in between. There is further provided a horizontal holding bracket 11 behind the connecting point (a pin 7) between the link lever 5 and the bracket 4 such that the bracket 11 can be swung. The two points (pins 15, 16) below the swinging center (a pin 12) of the bracket 11 are connected to the bracket 2 by a pair of parallel links 13, 14 respectively. A suitable point (a pin 9) of the bracket 11 and a suitable point (a pin 10) placed on the side of the chassis 1 and behind the swinging center (the pin 12) of the bracket 11 are connected by a cylinder (a hydraulic cylinder 8) swingable in between.