A display device (100, 101), comprising: a display unit; a light source disposed on a back surface side of the display unit and configured to irradiate light to the display unit; an optical member disposed between the display unit and the light source; and a support member (13, 131 - 136) supporting at its front end the optical member from a back surface side of the optical member, and having a side surface (13i, 136g, 13j, 136h, 135a) extending from the front end of the support member (13, 131-136) substantially in a backward direction, wherein the support member (13, 131-136) is disposed so that light irradiated from the light source is incident onto the side surface (13i, 136g, 135a) of the support member (13, 131-136) and so that the light incident onto the side surface (13i, 136g, 135a) is transmitted through the support member (13, 131-136), wherein the support member (13, 131 -136) comprises: an entrance portion (13k, 132a, 134a, 135b) comprising an inclined surface (13m, 132b) that is inclined relative to the side surface and arranged to reflect the light incident onto the side surface (13i, 136g, 135a); and a light guide portion configured to guide the light reflected at the inclined surface (13m, 132b) towards the front end of the support member (13, 131-136), characterised in that the entrance portion (13k, 132a, 134a, 135b) is formed as a recess in the support member (13, 131-136), wherein the recess comprises an opening in the side surface (13j, 136h, 135a) facing away from the light source and the inclined surface (13m, 132b) which is disposed on the side of the opening facing towards the front end of the support member (13, 131-136). a display unit; a light source disposed on a back surface side of the display unit and configured to irradiate light to the display unit; an optical member disposed between the display unit and the light source; and a support member (13, 131 - 136) supporting at its front end the optical member from a back surface side of the optical member, and having a side surface (13i, 136g, 13j, 136h, 135a) extending from the front end of the support member (13, 131-136) substantially in a backward direction, wherein the support member (13, 131-136) is disposed so that light irradiated from the light source is incident onto the side surface (13i, 136g, 135a) of the support member (13, 131-136) and so that the light incident onto the side surface (13i, 136g, 135a) is transmitted through the support member (13, 131-136), wherein the support member (13, 131 -136) comprises: an entrance portion (13k, 132a, 134a, 135b) comprising an inclined surface (13m, 132b) that is inclined relative to the side surface and arranged to reflect the light incident onto the side surface (13i, 136g, 135a); and a light guide portion configured to guide the light reflected at the inclined surface (13m, 132b) towards the front end of the support member (13, 131-136), an entrance portion (13k, 132a, 134a, 135b) comprising an inclined surface (13m, 132b) that is inclined relative to the side surface and arranged to reflect the light incident onto the side surface (13i, 136g, 135a); and a light guide portion configured to guide the light reflected at the inclined surface (13m, 132b) towards the front end of the support member (13, 131-136),