To prevent electric connection failure between a light source board and a power supply member in a lighting device.

A lighting device 12 includes light sources 24, light source boards 25 for mounting the light sources 24, power supply members 43 for supplying power to the light sources 24, recessed connection sections 55 arranged on one side of the light source board 25 and the power supply member 43 and internally having a plurality of fitting spaces IS, projected connection sections 54 arranged on the other side of the light source board 25 and the power supply member 43 and electrically connected with each other by being fitted with the recessed connection sections 55 and diverged into a plurality of numbers along a direction crossing with a fitting direction of the recessed connection section 55 and having a plurality of branch sections 56 inserted into respective fitting spaces IS, and guiding sections 60 arranged inside the recessed connection sections 55 and guiding insertion of the branch sections 56 into the fitting spaces IS so as to make the projected connection sections 54 fit into the recessed connection sections 55.