Patent ID: 8736798

Claim:
An optical element comprising: a phase retardation layer comprising a liquid crystal layer, of which a difference between in-plane refractive indexes in a slow axis direction and a fast axis direction is 0.05 to 0.2 and which has a thickness of 0.5 μm to 2.0 μm, and comprises a polymerizable liquid crystal compound; a polarizing plate which is attached to the phase retardation layer by a first pressure-sensitive adhesive layer and comprises a polarizer; and a second pressure-sensitive adhesive layer that is formed on a side, to which the first pressure sensitive adhesive is not attached, of the polarizing plate, and has a storage modulus at 25° C. of greater than 0.08 MPa, wherein the second pressure-sensitive adhesive layer comprises a cross-linking structure comprising an acrylic polymer cross-linked by a multifunctional cross-linking agent and a cross-linking structure comprising a polymerized active energy ray-polymerizable compound.