An image display device for displaying an image and configured to emit light of at least one wavelength, comprising: a laser light source; a transmitting-reflecting member; and a single microlens array arranged on an optical path between the laser light source and the transmitting-reflecting member, the microlens array comprising a plurality of microscopic convex lenses; wherein the image is formed by the light emitted from the laser light source incident on the transmitting-reflecting member, characterized in that: the laser light source is arranged such that there are more S polarization components of the light which is incident on the transmitting-reflecting member with respect to the transmitting-reflecting member than P polarization components; a curvature radius of a curved surface between border portions of the plurality of microscopic convex lenses of the microlens array is less than a longest wavelength emitted by the laser light source; and an effective cross-section of the light which is emitted from the laser light source has an oval shape at the microlens array, and each of the plurality of lenses has different curvatures regarding first and second directions which are perpendicular to each other in a plane perpendicular to an optical axis, such that the direction of the long diameter and the direction of the short diameter of the effective cross-section of the light which is emitted from the laser light source are reversed after the light which is emitted from the laser light source is transmitted through each of the lenses. a laser light source; a transmitting-reflecting member; and a single microlens array arranged on an optical path between the laser light source and the transmitting-reflecting member, the microlens array comprising a plurality of microscopic convex lenses; wherein the image is formed by the light emitted from the laser light source incident on the transmitting-reflecting member, characterized in that: the laser light source is arranged such that there are more S polarization components of the light which is incident on the transmitting-reflecting member with respect to the transmitting-reflecting member than P polarization components; a curvature radius of a curved surface between border portions of the plurality of microscopic convex lenses of the microlens array is less than a longest wavelength emitted by the laser light source; and an effective cross-section of the light which is emitted from the laser light source has an oval shape at the microlens array, and each of the plurality of lenses has different curvatures regarding first and second directions which are perpendicular to each other in a plane perpendicular to an optical axis, such that the direction of the long diameter and the direction of the short diameter of the effective cross-section of the light which is emitted from the laser light source are reversed after the light which is emitted from the laser light source is transmitted through each of the lenses. the laser light source is arranged such that there are more S polarization components of the light which is incident on the transmitting-reflecting member with respect to the transmitting-reflecting member than P polarization components; a curvature radius of a curved surface between border portions of the plurality of microscopic convex lenses of the microlens array is less than a longest wavelength emitted by the laser light source; and an effective cross-section of the light which is emitted from the laser light source has an oval shape at the microlens array, and each of the plurality of lenses has different curvatures regarding first and second directions which are perpendicular to each other in a plane perpendicular to an optical axis, such that the direction of the long diameter and the direction of the short diameter of the effective cross-section of the light which is emitted from the laser light source are reversed after the light which is emitted from the laser light source is transmitted through each of the lenses.