To provide a projection type display device capable of informing a user of occurrence of abnormality through vision even when the abnormality occurs in which the user cannot visually confirm an image.

A head-up display (HUD) device 100 for vehicle includes a light projection part 102 which projects projection light 103 corresponding to image information to the surface side of a combiner 104, and makes the image displayed on the surface of the combiner by the projection light projected by the light projection part. In this HUD device, an error indicator 210 is provided in which the error is indicated to a driver 106 without using the light projection part when a temperature sensor 209 detects the temperature out of a specified temperature range.