A display device (2, 2A) comprising: a light source configured to emit a light beam; a scanner configured to cause the light beam from the light source to scan; a movable screen (28, 28A) in which an image is formed by transmitting the light beam from the scanner; an optical system (10, 32) configured to display project a virtual image of the image formed in the movable screen (28, 28A); and a driver configured to cause the movable screen (28, 28A) to reciprocate in a first direction separating from the scanner and in a second direction approaching the scanner, wherein the image projected is displayed as a virtual image of the image in a space in front of the optical system (10, 32), and the movable screen (28, 28A) reciprocates in a posture inclined to moving directions of the movable screen (28, 28A) with a first end of the movable screen (28, 28A) farther from the scanner and a second end of the movable screen (28, 28A) closer to the scanner, wherein the scanner forms a first image in the movable screen (28, 28A) while the movable screen (28, 28A) moves in one of the first direction and the second direction, and the optical system (10, 32) displays a vertical image that is a virtual image of the first image formed in the movable screen (28, 28A), in a vertical direction in the space, and/or the scanner forms a second image in the movable screen (28, 28A) while the movable screen (28, 28A) moves in the other one of the first direction and the second direction, and the optical system (10, 32) further displays a depth image that is a virtual image of the second image formed in the movable screen (28, 28A), in a depth direction that is a direction intersecting a vertical direction in the space. a light source configured to emit a light beam; a scanner configured to cause the light beam from the light source to scan; a movable screen (28, 28A) in which an image is formed by transmitting the light beam from the scanner; an optical system (10, 32) configured to display project a virtual image of the image formed in the movable screen (28, 28A); and a driver configured to cause the movable screen (28, 28A) to reciprocate in a first direction separating from the scanner and in a second direction approaching the scanner, wherein the image projected is displayed as a virtual image of the image in a space in front of the optical system (10, 32), and the movable screen (28, 28A) reciprocates in a posture inclined to moving directions of the movable screen (28, 28A) with a first end of the movable screen (28, 28A) farther from the scanner and a second end of the movable screen (28, 28A) closer to the scanner, wherein the scanner forms a first image in the movable screen (28, 28A) while the movable screen (28, 28A) moves in one of the first direction and the second direction, and the optical system (10, 32) displays a vertical image that is a virtual image of the first image formed in the movable screen (28, 28A), in a vertical direction in the space, and/or the scanner forms a second image in the movable screen (28, 28A) while the movable screen (28, 28A) moves in the other one of the first direction and the second direction, and the optical system (10, 32) further displays a depth image that is a virtual image of the second image formed in the movable screen (28, 28A), in a depth direction that is a direction intersecting a vertical direction in the space.