Microchip device for electrophoresis

A microchip device for electrophoresis comprising:

• a microchip having a separation flow route formed between transparent planar members and throughholes which are formed through one of said transparent planar members at positions corresponding to end points of said separation flow route so as to reach said separation flow route;
• an electrical power source for applying a migration potential difference between said end points of said separation flow route;
• a dispersing means for dispersing light received from each of positions within a specified range along said separation flow route in a perpendicular direction to said separation flow route;
• a two-dimensional light-receiving means for receiving dispersed light from said dispersing means at light-receiving positions which are two-dimensionally distributed parallel to and perpendicular to said separation flow route;
• a data processor for receiving measured values obtained repeatedly by said two-dimensional light-receiving means and carrying out multi-point averaging on said measured values for each of said light-receiving positions;
• and
• an optical system for switching between allowing and not allowing light to be made incident on said specified range along said separation flow route, forming a parallel beam out of light which has passed through said separation flow route to be made incident onto said dispersing means, and forming a parallel beam out of dispersed light from said dispersing means in said transverse direction, said optical system including a light source, a shutter which opens and closes to switch between allowing and not allowing light from said light source to pass therethrough, an aspherical len and a cylindrical len.