A liquid crystal display device comprising: a liquid crystal display panel; and a backlight including a light guide panel, an optical sheet, a light source having a plurality of LEDs arranged on a wiring substrate, and a connector for supplying power to the plurality of LEDs, wherein the light guide panel includes a concave portion extending parallel to a side of the light guide panel, the plurality of LEDs are placed in the concave portion, arranged in an extending direction of the concave portion of the light guide panel, the plurality of LEDs emit light parallel to a main surface of the light guide panel, first LEDs of the plurality of LEDs are arranged on a first line and emit light in a first direction, second LEDs of the plurality of LEDs are arranged on a second line and emit light in a direction opposite to the first direction, the first LEDs and the second LEDs are arranged alternately in the extending direction of the concave portion, and the first and the second lines are parallel to each other with a positional offset therebetween, characterised in that a first leader line for connecting one terminal of the first LEDs in the wiring substrate with the connector exists outside the first LEDs arranged on the first line, a second leader line for connecting one terminal of the second LEDs in the wiring substrate with the connector exists outside the second LEDs arranged on the second line and is electrically separated form the first leader line, the connector exists only on one side of the light guide panel and not on other sides of the light guide panel, a direction in which the light is emitted from the first LEDs is a direction of the second line, and a direction in which the light is emitted from the second LEDs is a direction of the first line. a liquid crystal display panel; and a backlight including a light guide panel, an optical sheet, a light source having a plurality of LEDs arranged on a wiring substrate, and a connector for supplying power to the plurality of LEDs, wherein the light guide panel includes a concave portion extending parallel to a side of the light guide panel, the plurality of LEDs are placed in the concave portion, arranged in an extending direction of the concave portion of the light guide panel, the plurality of LEDs emit light parallel to a main surface of the light guide panel, first LEDs of the plurality of LEDs are arranged on a first line and emit light in a first direction, second LEDs of the plurality of LEDs are arranged on a second line and emit light in a direction opposite to the first direction, the first LEDs and the second LEDs are arranged alternately in the extending direction of the concave portion, and the first and the second lines are parallel to each other with a positional offset therebetween, characterised in that a first leader line for connecting one terminal of the first LEDs in the wiring substrate with the connector exists outside the first LEDs arranged on the first line, a second leader line for connecting one terminal of the second LEDs in the wiring substrate with the connector exists outside the second LEDs arranged on the second line and is electrically separated form the first leader line, the connector exists only on one side of the light guide panel and not on other sides of the light guide panel, a direction in which the light is emitted from the first LEDs is a direction of the second line, and a direction in which the light is emitted from the second LEDs is a direction of the first line.