A thin input device with a flat input side surface is provided in which a flexible circuit board is disposed inside a chassis so as to extend to the outside or inside of the chassis while preventing the flexible circuit board from bending awkwardly. An opening for exposing a portion of a bottom surface of an input panel is formed on a bottom wall of the chassis. A through-hole for guiding the flexible circuit board to the anti-input side of the input panel is formed on a second base disposed on the anti-input side so that the through-hole is inside a first base disposed on the input side at a position corresponding to the opening. The flexible circuit board is disposed to extend to the outside or inside of the chassis through the through-hole.