A stereo-image displaying apparatus includes a light-source module and an image displaying device. In addition, a reaction protection layer 15 made of Si3N4 or SiO2 is formed on the second dielectric layer 14. ; iii) a GG ratio of 18 or more when G is 10 Pa when measured at a frequency of 1 hz; and iv) a viscosity of 5000 mPasec or less at 190 C.