Composition including compound having mesogenic group, polymer and optically anisotropic body obtained by polymerizing polymerizable composition, and phase difference film

A polymerizable composition comprising:

• a compound that has at least one mesogenic group and satisfies an expression represented by Expression (1):
• Re(450 nm)/Re(550 nm)<1.05 Expression (1)
• wherein Re (450 nm) represents an in-plane phase difference at a wavelength of 450 nm obtained in the case where the molecules of the compound are aligned on a substrate such that a major axis direction of each molecule is aligned substantially horizontally with respect to the substrate, and Re (550 nm) represents an in-plane phase difference at a wavelength of 550 nm obtained in the case where the molecules of the compound are aligned on a substrate such that a major axis direction of each molecule is aligned substantially horizontally with respect to the substrate,
• the composition satisfying an expression represented by Expression (2):
• 1.0≤YI/Δn≤500 Expression (2)
• wherein YI represents a yellowness index of a material consisting only of the above-defined compound present in the polymerizable composition, Δn represents a refractive index anisotropy of a material consisting only of the above-defined compound present in the polymerizable composition, provided that a chiral compound having a mesogenic group is excluded from a material consisting only of the above-defined compound.