A light source device which can prevent a stress from being generated on each of circuit boards when connected through a connector and fixed to a support body through a fixture, is provided. Moreover, between source electrodes and drain electrodes in the entire Switch MMIC, the gate wiring electrodes are disposed. A light source is arranged in the vertical direction with respect to a screen of the liquid crystal panel so that light from the light source is directed toward the liquid crystal panel by a reflector. The movable portion is disposed adjacent to the supporting portion and moved in a first direction to sustain against the loop structure and in a second direction to prop open the loop structure after the stapling medium is held by the supporting portion, thereby allowing the open loop structure to hook in the hole structure of the article. A thermally conductive member extends between the heat sink and the transfer element to convey thermal energy therebetween. Exemplary methods of mounting rods in hexapole, octupole, and other multipole geometries are described.