A display device comprising: a display component having a display face, being mainly composed of liquid crystal cells, and configured to display an image; at least one light source as a backlight; a support member supporting the at least one light source; an optical element positioned in a light emission direction from the Z at least one light source, and covering the at least one light source from the display component side, the at least one light source being mounted on a board of the display device and supported on the support member via the board, and the board being fixed to the support member; and a first reflective member (7, 107, 207) positioned rearward of the display component; wherein a first opening and a second opening (22, 122, 222) are formed in the first reflective member (7, 107, 207); the second opening (22, 122, 222) is dimensioned such that the at least one light source is disposed inside the second opening (22, 122, 222) being continuously connected with the first opening; and wherein, in a first direction, the width of the optical element is smaller than the width of the first opening and is larger than the width of the second opening (22, 122, 222); and the first opening and the second opening (22, 122, 222) are linearly continuous along a slide direction (S2, S4) which is perpendicular to the first direction; the optical element includes a plurality of legs disposed around the at least one light source and fixed to the board; wherein, in the first direction, the width of the second opening (22, 122, 222) is larger than a distance between the legs in the first direction, and in a plan view seen from the display component side, an outer edge of the second opening (22, 122, 222) is disposed at a location that overlaps the optical element, and is disposed so that the outer edge surrounds the at least one light source and the legs, wherein the display device is configured such that the first reflective member (7, 107, 207) is disposed between the optical element and the support member: by first inserting the optical element through and into the first opening, and then by sliding the at least one light source in the slide direction (S2, S4) along a rear face of the display component so as to be disposed inside the second opening (22, 122, 222). a display component having a display face, being mainly composed of liquid crystal cells, and configured to display an image; at least one light source as a backlight; a support member supporting the at least one light source; an optical element positioned in a light emission direction from the Z at least one light source, and covering the at least one light source from the display component side, the at least one light source being mounted on a board of the display device and supported on the support member via the board, and the board being fixed to the support member; and a first reflective member (7, 107, 207) positioned rearward of the display component; wherein a first opening and a second opening (22, 122, 222) are formed in the first reflective member (7, 107, 207); the second opening (22, 122, 222) is dimensioned such that the at least one light source is disposed inside the second opening (22, 122, 222) being continuously connected with the first opening; and wherein, in a first direction, the width of the optical element is smaller than the width of the first opening and is larger than the width of the second opening (22, 122, 222); and the first opening and the second opening (22, 122, 222) are linearly continuous along a slide direction (S2, S4) which is perpendicular to the first direction; the optical element includes a plurality of legs disposed around the at least one light source and fixed to the board; wherein, in the first direction, the width of the second opening (22, 122, 222) is larger than a distance between the legs in the first direction, and in a plan view seen from the display component side, an outer edge of the second opening (22, 122, 222) is disposed at a location that overlaps the optical element, and is disposed so that the outer edge surrounds the at least one light source and the legs, wherein the display device is configured such that the first reflective member (7, 107, 207) is disposed between the optical element and the support member: by first inserting the optical element through and into the first opening, and then by sliding the at least one light source in the slide direction (S2, S4) along a rear face of the display component so as to be disposed inside the second opening (22, 122, 222). by first inserting the optical element through and into the first opening, and then by sliding the at least one light source in the slide direction (S2, S4) along a rear face of the display component so as to be disposed inside the second opening (22, 122, 222).