| 摘要 |
A retardation film, formed by stretching a film comprising a norbornene-based ring-opening copolymer containing
a structural unit (A) represented by the following general formula (1):
general formula (2):
[in the formula (2), m represents an integer of any one of 0 and 1, X 2 represents a group represented by a formula: -CH=CH- or the like, and R 2 , R 3 , R 4 , and R 5 each independently represent a hydrogen atom or the like], wherein
a content of the structural unit (A) is not less than 5 mol % but not more than 95 mol % relative to a total amount of the structural units (A) and (B).
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