Head-up display device

Provided is a head-up display device capable of suppressing an error in the mounting position of a fixed mirror. A head-up display device is provided with: a display that emits display light; a first mirror (11) that reflects display light from the display; a second mirror that is provided so as to be rotatable about a rotation axis and reflects the display light reflected by the first mirror (11) toward a windshield; a mirror support section (33) that supports the first mirror (11); a housing case part (35) that houses the second mirror and is integrally formed with the mirror support part (33); and leaf springs (40L, 40R, 40C) that fix the first mirror (11) to the mirror support section (33) by pressing the first mirror (11) toward the mirror support section (33). 提供一种能够抑制固定反射镜的安装位置的误差的平视显示装置。平视显示装置具备：显示器，其射出显示光；第一反射镜(11)，其反射来自显示器的显示光；第二反射镜，其设置为能够以旋转轴为中心旋转，朝向挡风玻璃反射由第一反射镜(11)反射的显示光；反射镜支承部(33)，其支承第一反射镜(11)；收容壳体部(35)，其收容第二反射镜，并与反射镜支承部(33)一体地形成；以及板簧(40L、40R、40C)，其通过朝向反射镜支承部(33)按压第一反射镜(11)来将第一反射镜(11)固定于反射镜支承部(33