To provide a light guide plate for a liquid crystal screen display device that can attain an excellent visual effect.

Printed data of a light reflection pattern stored in a computer is transferred to an inkjet printer, and a light guide plate is made with the inkjet printer on an approximately rectangular printing surface surrounded with upper and lower and right and left edge parts of the light guide plate by applying reflecting printing for making light emitted from a light source to inside the light guide plate reflect at random. The printed data for performing reflection printing is prepared to make concentration of printing become higher toward a high concentration setting point established to be located in front of edges respectively opposed from four-directional edges corresponding to the four-directional edge parts of the light guide plate. The reflection printing is performed by using a white ink containing titanium oxide.