To provide: a polyester composition having less clouding degree even if it is thin-molded and excellent in tensile strength and tensile modulus of elasticity; its manufacturing method; and a thin bottle obtained by melting-molding the polyester composition.

In the polyester composition comprising aromatic polyester and spherical silica, an average particle diameter of the spherical silica is 20-180 nm, and 0.01-0.6 wt.% of the spherical silica is contained based on the whole weight of the polyester composition.