A display device comprising: a display panel that displays an image; a plurality of mount boards having long-length shapes disposed along the display panel; light emitting elements arrayed on each of the plurality of mount boards in a longitudinal direction of each of the plurality of mount boards, the light emitting elements emitting light toward the display panel from behind the display panel, and being arranged in a matrix shape along the display panel; a back surface board; a reflective sheet mounted to the back surface board, the reflective sheet having holes (151; 1082) through which the light emitting elements pass through at positions corresponding to the light emitting elements, and reflecting the light emitted from the light emitting elements toward the display panel, and a relay board having a long-length shape and being provided to supply power to the light emitting elements, wherein each of the plurality of mount boards is constituted of a flexible wiring board, wherein on a surface of the back surface board on which the plurality of mount boards is stuck, a recess, which is depressed toward an opposite surface of the surface on which the plurality of mount boards is stuck, is provided in a direction perpendicular to the longitudinal direction of each of the plurality of mount boards, and wherein the relay board is placed in the recess and is placed at an end of each of the plurality of mount boards, said ends being deformed along the shape of the recess and being located in the recess, such that the relay board is electrically connected with each of the plurality of mount boards. a display panel that displays an image; a plurality of mount boards having long-length shapes disposed along the display panel; light emitting elements arrayed on each of the plurality of mount boards in a longitudinal direction of each of the plurality of mount boards, the light emitting elements emitting light toward the display panel from behind the display panel, and being arranged in a matrix shape along the display panel; a back surface board; a reflective sheet mounted to the back surface board, the reflective sheet having holes (151; 1082) through which the light emitting elements pass through at positions corresponding to the light emitting elements, and reflecting the light emitted from the light emitting elements toward the display panel, and a relay board having a long-length shape and being provided to supply power to the light emitting elements, wherein each of the plurality of mount boards is constituted of a flexible wiring board, wherein on a surface of the back surface board on which the plurality of mount boards is stuck, a recess, which is depressed toward an opposite surface of the surface on which the plurality of mount boards is stuck, is provided in a direction perpendicular to the longitudinal direction of each of the plurality of mount boards, and wherein the relay board is placed in the recess and is placed at an end of each of the plurality of mount boards, said ends being deformed along the shape of the recess and being located in the recess, such that the relay board is electrically connected with each of the plurality of mount boards.