Stretched optical compensation film

A stretched optical compensation film comprising 0.5 to 30 parts by mass of a β-diketone compound represented by the following Formula (I-1) with respect to 100 parts by mass of a cellulose-based resin:

• wherein X1 to X10 each independently represent a hydrogen atom, a hydroxy group, a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkanoyloxy group having 1 to 10 carbon atoms, an alkoxycarbonyl group having 1 to 10 carbon atoms, an alkoxyalkyleneoxy group having 2 to 20 carbon atoms, an alkoxycarbonylalkyleneoxy group having 3 to 21 carbon atoms, a phenyl group or a —NR4R5 group, wherein R4 and R5 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an acyl group having 1 to 10 carbon atoms;
• and
• at least one pair of X1 and X2, X2 and X3, X4 and X5, X6 and X7, X7 and X8, X8 and X9, and X9 and X10 optionally form a benzene ring together;
• X2, X3, and X4, or X8, X9 and X10 are methoxy, or
• at least one of X1-X10 is a —NR4R5 group, wherein R4 and R5 are hydrogen, or at least one of R4 and R5 is an acyl group.