US Patent 8934183 Optical element and optical system including the optical element

An optical element is provided, which is small in distortion when at least three optical members including a resin layer sandwiched by the optical members are cemented together, has a high environmental resistance and optical performance, and has an excellent chromatic aberration correction effect. In the optical element, the resin layer is formed on one of light incident/exit surfaces of a first optical member, and a second optical member is cemented to the resin layer by a bonding material. A condition of φg<φr is satisfied where φr indicates an outer diameter of the resin layer and φg indicates an effective region diameter of a surface of the second optical member which is cemented to the resin layer.