An IPP resin material capable of improving the adhesive strength between a transparent electrode and an IPP resin layer is disclosed. The IPP resin material includes: a liquid pre-polymer including a mono-functional monomer, a di-functional monomer including a monomer containing an ether group, and a tri-functional monomer including pentaerythritol triacrylate; a photo initiator; and a adhesion promoter, wherein the monomer containing the ether group includes any one of poly(propylene glycol)diacrylate, poly(propylene glycol)dimethacrylate, propylene glycol diacrylate), and tri(ethylene glycol)dimethacrylate.