Lighting device, display device and television device

A lighting device comprising:

• a light guide plate having a plate shape, the light guide plate including a light exit surface on one plate surface thereof, an opposite surface on another plate surface thereof, a groove in one of the light exit surface and the opposite surface, the groove extending along an edge of a plate surface of the light guide plate, a light entrance surface on one inner side surface of the groove, and an opposite side surface on another inner side surface of the groove;
• a holding member including a portion being in contact with the opposite side surface, and a portion being on a side of one edge surface of the light guide plate, the one edge surface being opposite to the opposite side surface having a part of the light guide plate between the one edge surface and the opposite side surface, and the holding member holding the part of the light guide plate between the portions thereof;
• a light source board arranged on a surface of the portion of the holding member that is in contact with the opposite side surface, the light source board arranged on the surface that is opposite to a surface of the portion that is in contact with the opposite side surface;
• and
• a light source arranged on the light source board with a light emission surface thereof facing the light entrance surface.