A gap and height difference measurement module may include a mounting frame with a flange mounted on a first end thereof and a connecting frame mounted on a second end of the mounting frame, first and second housings mounted on both sides of the connecting frame respectively, a first light source mounted on a lower end of the first housing and emitting light onto the panels, a second light source mounted on a lower end of the second housing and emitting light onto the panels, first and second sensors respectively mounted on front ends of the first and second housings, and first and second filters that are respectively mounted to the first and second sensors so as to allow the first and second sensors to each extract straight-line elements from cross sections formed as the lights emitted from the first and second light are irradiated onto the panels.