Patent ID: 7618715

Claim:
A wave plate comprising at least two retardation films, which are obtained by stretch-orientating cycloolefin resin films and which are laminated on each other, wherein on at least one surface of said laminated retardation films a glass substrate is laminated, and wherein the retardation films, and the retardation film and the glass substrate are lamination-fixed respectively with different adhesives which are selected from the following adhesives (A) and (B): an adhesive (A) having a glass transition temperature of not higher than 0° C. and a Young's modulus at 23° C. of not more than 10 MPa, and an adhesive (B) having a glass transition temperature of not lower than 40° C. and a Young's modulus at 23° C. of not less than 30 MPa, with the proviso that a difference in glass transition temperature between the adhesive (A) and the adhesive (B) is 60° C. or more and a difference in Young's modulus at 23° C. between the adhesive (A) and the adhesive (B) is 40 MPa or more.