<p>A head-up display device (10) has a displayer (11), reflection member (12), and a housing (15). The displayer (11) emits display light (L). The reflection member (12) reflects the display light (L). The housing (15) has an opening portion (15b) and receives the displayer (11) and the reflection member (12). A holding member (13) is removably attached to the opening portion (15b) of the housing (15) and holds the reflection member (12). At the housing (15) is provided a positioning portion (15c) for positioning the holding member (13).</p>
