HEAD-UP DISPLAY DEVICE AND HELMET

A HUD device (3) mounted on a helmet (101) includes a projection module (39) configured to project display light for displaying a display image capable of being visually recognized as a virtual image. The projection module includes a light emitter (57) configured to emit display light and a concave mirror (59) configured to reflect display light emitted by the light emitter toward a combiner. The light emitter and the concave mirror are incorporated separately in the left and right sides of a chin portion (111) of a helmet. The light emitter includes a first portion (57A) including an LED (61) and a second portion (57B) including a display element (63). The first portion extends from a lower side of the second portion toward the concave mirror.