An image display system comprising: a display device configured to display a received image; a light emitting device configured to emit light to a region along a predetermined flat display surface on which the image is displayed by the display device, and to form a light layer along the predetermined flat display surface; a detection device configured to detect the reflected positions of light, which is emitted from the light emitting device, in the region; and an image generation device configured to generate an image according to a detected result obtained by the detection device, and to transmit the image to the display device; the light emitting device comprising: a light source unit configured to emit light to the region along the predetermined flat display surface; a frame in which the light source unit is provided; and an adjustment mechanism configured to adjust an emission direction of light emitted from the light source unit, relative to the predetermined flat display surface; wherein the frame includes a pivotal portion, wherein the adjustment mechanism is configured to adjust the emission direction of light by adjusting the inclination of the frame around the pivotal portion relative to the predetermined flat display surface, and wherein the image display system is characterised in that the pivotal portion is positioned opposite to the emission direction of light with respect to the adjustment mechanism, in that the adjustment mechanism includes a first adjustment mechanism and a second adjustment mechanism which are provided in a portion of the frame on the side of the emission direction of light, and are disposed while being spaced therebetween when seen from a direction perpendicular to the predetermined flat display surface, and in that at least either of the first adjustment mechanism and the second adjustment mechanism includes: a fixing member that is disposed along an end portion of the frame in the emission direction of light, and is fixed independently from the frame; a shaft member that is turnably provided in the fixing member; and a moving member which is engaged with the shaft member, and is configured to be moved along a central axis of the shaft member such that the frame is moved along the central axis. a display device configured to display a received image; a light emitting device configured to emit light to a region along a predetermined flat display surface on which the image is displayed by the display device, and to form a light layer along the predetermined flat display surface; a detection device configured to detect the reflected positions of light, which is emitted from the light emitting device, in the region; and an image generation device configured to generate an image according to a detected result obtained by the detection device, and to transmit the image to the display device; the light emitting device comprising: a light source unit configured to emit light to the region along the predetermined flat display surface; a frame in which the light source unit is provided; and an adjustment mechanism configured to adjust an emission direction of light emitted from the light source unit, relative to the predetermined flat display surface; a light source unit configured to emit light to the region along the predetermined flat display surface; a frame in which the light source unit is provided; and an adjustment mechanism configured to adjust an emission direction of light emitted from the light source unit, relative to the predetermined flat display surface; wherein the frame includes a pivotal portion, wherein the adjustment mechanism is configured to adjust the emission direction of light by adjusting the inclination of the frame around the pivotal portion relative to the predetermined flat display surface, and wherein the image display system is characterised in that the pivotal portion is positioned opposite to the emission direction of light with respect to the adjustment mechanism, in that the adjustment mechanism includes a first adjustment mechanism and a second adjustment mechanism which are provided in a portion of the frame on the side of the emission direction of light, and are disposed while being spaced therebetween when seen from a direction perpendicular to the predetermined flat display surface, and in that at least either of the first adjustment mechanism and the second adjustment mechanism includes: a fixing member that is disposed along an end portion of the frame in the emission direction of light, and is fixed independently from the frame; a shaft member that is turnably provided in the fixing member; and a moving member which is engaged with the shaft member, and is configured to be moved along a central axis of the shaft member such that the frame is moved along the central axis. a fixing member that is disposed along an end portion of the frame in the emission direction of light, and is fixed independently from the frame; a shaft member that is turnably provided in the fixing member; and a moving member which is engaged with the shaft member, and is configured to be moved along a central axis of the shaft member such that the frame is moved along the central axis.