Provided is a headup display device which is not liable to generate abnormal sound. The headup display device comprises: a liquid crystal display for emitting display light; a concave mirror for reflecting the display light; and a motor device for rotating the concave mirror. The motor device includes: a motor having a motor shaft projecting from a motor body; a worm connected to the motor shaft and having a spiral groove formed on the outer peripheral surface; and a worm wheel provided with teeth engaging with the spiral groove and transmitting a driving force from the motor to the concave mirror. A hole is formed inside the worm extending in the axial direction of the worm from the end face of the worm near the motor body. A compression coil spring is arranged in the hole for biasing the worm in the direction opposite the motor body and biasing the motor shaft toward the motor body.