A virtual image display device that displays a virtual image by projecting light of an image onto a projection portion, the virtual image display device comprising: a light source that emits light; an image member that forms the image by partially shielding the light; and a Fresnel lens array arranged in an optical path between the light source and the image member and having an array structure (40, 240) in which a plurality of Fresnel lens units (44, 244) are arrayed, each of the plurality of Fresnel lens units having an individual area, wherein an overall reference axis line is defined as a virtual center line of the array structure that passes through the array structure, an individual center axis line is defined as a center line of the individual area that is parallel to the overall reference axis line and passes through the individual area, each of the plurality of Fresnel lens units includes a plurality of divided lens surfaces (45, 245), the plurality of divided lens surfaces curving convexly or the plurality of divided lens surfaces curving concavely, the array structure includes a plurality of eccentric Fresnel lens units (44E, 244E) as the plurality of Fresnel lens units, the plurality of divided lens surfaces (45E, 245E) of each of the plurality of eccentric Fresnel lens units have curvature centers (CC, CCE) that are offset from the individual center axis line toward a same side of the individual center axis line, the same side being an overall reference axis side of the individual center axis line that is close to the overall reference axis line or an opposite side of the individual center axis line that is away from the overall reference axis line, the curvature center of each divided lens surface belonging to the same eccentric Fresnel lens unit is offset from the individual center axis line by a specific offset amount that is set every eccentric Fresnel lens units, an inter-axis distance is defined as a distance between the overall reference axis line and the individual center axis line, and the specific offset amount of the eccentric Fresnel lens units having a larger value of the inter-axis distance is greater than the specific offset amount of the eccentric Fresnel lens units having a smaller value of the inter-axis distance. a light source that emits light; an image member that forms the image by partially shielding the light; and a Fresnel lens array arranged in an optical path between the light source and the image member and having an array structure (40, 240) in which a plurality of Fresnel lens units (44, 244) are arrayed, each of the plurality of Fresnel lens units having an individual area, wherein an overall reference axis line is defined as a virtual center line of the array structure that passes through the array structure, an individual center axis line is defined as a center line of the individual area that is parallel to the overall reference axis line and passes through the individual area, each of the plurality of Fresnel lens units includes a plurality of divided lens surfaces (45, 245), the plurality of divided lens surfaces curving convexly or the plurality of divided lens surfaces curving concavely, the array structure includes a plurality of eccentric Fresnel lens units (44E, 244E) as the plurality of Fresnel lens units, the plurality of divided lens surfaces (45E, 245E) of each of the plurality of eccentric Fresnel lens units have curvature centers (CC, CCE) that are offset from the individual center axis line toward a same side of the individual center axis line, the same side being an overall reference axis side of the individual center axis line that is close to the overall reference axis line or an opposite side of the individual center axis line that is away from the overall reference axis line, the curvature center of each divided lens surface belonging to the same eccentric Fresnel lens unit is offset from the individual center axis line by a specific offset amount that is set every eccentric Fresnel lens units, an inter-axis distance is defined as a distance between the overall reference axis line and the individual center axis line, and the specific offset amount of the eccentric Fresnel lens units having a larger value of the inter-axis distance is greater than the specific offset amount of the eccentric Fresnel lens units having a smaller value of the inter-axis distance.