Patent ID: 8742772

Claim:
A touch panel sensor comprising: a film base material; a first transparent electrode pattern formed on a first face of the film base material; a first adhesive layer laminated on the first face of the film base material so as to cover the first transparent electrode pattern; a second transparent electrode pattern formed on a second face of the film base material; and a second adhesive layer laminated on the second face of the film base material so as to cover the second transparent electrode pattern, wherein the film base material has an in-plane phase difference of λ/4 with respect to a wavelength λ in a visible light region, and n e1 −n a1 ≧0.3 and n e2 −n a2 ≧0.3, where n e1 is a refractive index of the first transparent electrode pattern, n e2 is a refractive index of the second transparent electrode pattern, n a1 is a refractive index of the first adhesive layer, and n a2 is a refractive index of the second adhesive layer.