A head-up display device comprising: a device body adapted to be disposed under a dashboard of a vehicle; a combiner configured to be moved through an opening formed in the dashboard between a use position located over the dashboard and a housed position located under the dashboard; a display that is provided in the device body and projects a virtual image on the combiner placed at the use position; a combiner moving mechanism that is provided in the device body and is adapted to move the combiner between the use position and the housed position; a shutter that has approximately the same external shape as the opening and configured to be moved between a closing position where the shutter closes the opening and an escape position where the shutter is oriented vertically and is located under the opening of the dashboard; and a shutter moving mechanism that is provided in the device body and is adapted to move the shutter to the escape position located under the opening when the combiner is moved to the use position, and moves the shutter to the closing position when the combiner is moved to the housed position, wherein the combiner moving mechanism comprises a support stage to which a bottom end of the combiner is fixed, a feed screw which extends in the vertical direction and is threadedly engaged with a screw hole that is formed in a block linked to the support stage, and a combiner drive motor which rotates the feed screw; the device being characterized in that: guide members having respective racks extending in the vertical direction are disposed on both sides of the support stage; the support stage has a synchronized shaft that is supported so as to be rotatable about a horizontal axial line; and gears that are in mesh with the respective racks are attached to both ends of the synchronized shaft. a device body adapted to be disposed under a dashboard of a vehicle; a combiner configured to be moved through an opening formed in the dashboard between a use position located over the dashboard and a housed position located under the dashboard; a display that is provided in the device body and projects a virtual image on the combiner placed at the use position; a combiner moving mechanism that is provided in the device body and is adapted to move the combiner between the use position and the housed position; a shutter that has approximately the same external shape as the opening and configured to be moved between a closing position where the shutter closes the opening and an escape position where the shutter is oriented vertically and is located under the opening of the dashboard; and a shutter moving mechanism that is provided in the device body and is adapted to move the shutter to the escape position located under the opening when the combiner is moved to the use position, and moves the shutter to the closing position when the combiner is moved to the housed position, wherein the combiner moving mechanism comprises a support stage to which a bottom end of the combiner is fixed, a feed screw which extends in the vertical direction and is threadedly engaged with a screw hole that is formed in a block linked to the support stage, and a combiner drive motor which rotates the feed screw; the device being characterized in that: guide members having respective racks extending in the vertical direction are disposed on both sides of the support stage; the support stage has a synchronized shaft that is supported so as to be rotatable about a horizontal axial line; and gears that are in mesh with the respective racks are attached to both ends of the synchronized shaft.