A display device mounted on a conveyance, the display device being for projecting display light showing video onto a light transmission member and therefore displaying a virtual image of the video while superposing the virtual image on scenery visually recognized through the light transmission member, the display device comprising: display means for emitting the display light; reflection means for reflecting the display light emitted by the display means toward the light transmission member; identification means for identifying a predetermined target outside the conveyance; control means for controlling the display means to display, in the video, a first capturing image (Va, Vc) to be visually recognized in a state in which the first capturing image (Va, Vc) is superposed on at least a part of the target identified by the identification means; characterized by vibration detection means for detecting an amount of vibration of the conveyance, wherein: in the case where the amount of vibration detected by the vibration detection means exceeds a threshold value determined in advance, the control means displays, in the video, a second capturing image (Vb, Vd) to be visually recognized in a state in which the second capturing image (Vb, Vd) is superposed on at least a part of the target, instead of the first capturing image (Va, Vc); the second capturing image (Vb, Vd) is an image in which a color shade difference between pixels constituting an image end and a region outside the image and adjacent to the image end is reduced in comparison to the first capturing image (Va, Vc), the color shade difference indicating a difference in luminance or brightness of color; and the second capturing image (Vb, Vd) is a gradation image in which color has reduced luminance or brightness from the image end toward a central portion. display means for emitting the display light; reflection means for reflecting the display light emitted by the display means toward the light transmission member; identification means for identifying a predetermined target outside the conveyance; control means for controlling the display means to display, in the video, a first capturing image (Va, Vc) to be visually recognized in a state in which the first capturing image (Va, Vc) is superposed on at least a part of the target identified by the identification means; characterized by vibration detection means for detecting an amount of vibration of the conveyance, wherein: in the case where the amount of vibration detected by the vibration detection means exceeds a threshold value determined in advance, the control means displays, in the video, a second capturing image (Vb, Vd) to be visually recognized in a state in which the second capturing image (Vb, Vd) is superposed on at least a part of the target, instead of the first capturing image (Va, Vc); the second capturing image (Vb, Vd) is an image in which a color shade difference between pixels constituting an image end and a region outside the image and adjacent to the image end is reduced in comparison to the first capturing image (Va, Vc), the color shade difference indicating a difference in luminance or brightness of color; and the second capturing image (Vb, Vd) is a gradation image in which color has reduced luminance or brightness from the image end toward a central portion. in the case where the amount of vibration detected by the vibration detection means exceeds a threshold value determined in advance, the control means displays, in the video, a second capturing image (Vb, Vd) to be visually recognized in a state in which the second capturing image (Vb, Vd) is superposed on at least a part of the target, instead of the first capturing image (Va, Vc); the second capturing image (Vb, Vd) is an image in which a color shade difference between pixels constituting an image end and a region outside the image and adjacent to the image end is reduced in comparison to the first capturing image (Va, Vc), the color shade difference indicating a difference in luminance or brightness of color; and the second capturing image (Vb, Vd) is a gradation image in which color has reduced luminance or brightness from the image end toward a central portion.