A display device and a mobile object. The display device is installable in a mobile object, and includes a light source, an image former to receive light emitted from the light source and output image light that forms an image, a screen on which the image light forms the image, a housing that houses the light source and the image former, and a holding member to hold the screen. The holding member is attached to the housing with a normal direction of a surface of the screen intersecting with a vertical direction and with a front-and-rear direction of the mobile object. A width of the housing is narrower than a width of the holding member. The mobile object includes the display device, a front windshield to reflect the image light, and an image-forming optical system to project the image light projected from the screen toward the front windshield.