A diffraction light guide plate comprising first and second diffraction optical elements (120, 130), wherein the first diffraction optical element is an element capable of receiving light incident onto the first diffraction optical element and outputting the light toward the second diffraction optical element, and the second diffraction optical element is an element capable of emitting light incident from the first diffraction optical element from the second diffraction optical element, and wherein the first diffraction optical element comprises a linear diffraction grating extending in a first direction, the second diffraction optical element comprises first and second regions (131, 132) and a third region existing between the first and second regions (131, 132), the first region comprises a linear diffraction grating extending in a second direction different from the first direction, the second region comprises a linear diffraction grating extending in a third direction different from the first and second directions, the third region comprises a diffraction grating in the form that the linear diffraction gratings of the first and second regions (131, 132) overlap, and the first to third regions (131, 132, 133) are disposed such that light incident from the first diffraction optical element is incident onto the first region without passing through the second and third regions (132, 133), the light is incident onto the second region without passing through the first and third regions (131, 132), and the light is also incident onto the third region without passing through the first and second regions, when the light incident from the first diffraction optical element passes through the first region, the light is incident onto the second and/or third region (132, 133), and the light incident onto the second and/or third region (132, 133) is emitted to the outside, when the light incident from the first diffraction optical element passes through the second region, the light is incident onto the first and/or third region (131, 133), and the light incident onto the first and/or third region (131, 133) is emitted to the outside, and when the light incident from the first diffraction optical element passes through the third region, the light is incident onto the first and/or second region (131, 132), and the light incident onto the first and/or second region (131, 132) is emitted to the outside. wherein the first diffraction optical element comprises a linear diffraction grating extending in a first direction, the second diffraction optical element comprises first and second regions (131, 132) and a third region existing between the first and second regions (131, 132), the first region comprises a linear diffraction grating extending in a second direction different from the first direction, the second region comprises a linear diffraction grating extending in a third direction different from the first and second directions, the third region comprises a diffraction grating in the form that the linear diffraction gratings of the first and second regions (131, 132) overlap, and the first to third regions (131, 132, 133) are disposed such that light incident from the first diffraction optical element is incident onto the first region without passing through the second and third regions (132, 133), the light is incident onto the second region without passing through the first and third regions (131, 132), and the light is also incident onto the third region without passing through the first and second regions, when the light incident from the first diffraction optical element passes through the first region, the light is incident onto the second and/or third region (132, 133), and the light incident onto the second and/or third region (132, 133) is emitted to the outside, when the light incident from the first diffraction optical element passes through the second region, the light is incident onto the first and/or third region (131, 133), and the light incident onto the first and/or third region (131, 133) is emitted to the outside, and when the light incident from the first diffraction optical element passes through the third region, the light is incident onto the first and/or second region (131, 132), and the light incident onto the first and/or second region (131, 132) is emitted to the outside.