Disclosed is an eye drop preparation comprising latanoprost, which is characterized in that the degradation of latanoprost in water can be prevented, the adsorption of latanoprost onto a plastic container can be prevented, and therefore the decrease in the latanoprost content can be prevented satisfactorily. The eye drop preparation comprises an eye drop composition comprising the following components (A)-(B) and packed in a plastic container: (A) latanoprost; and (B) a nonionic surfactant.
