An ophthalmologic apparatus includes: an optical system configured to acquire data of a subject's eye; a housing unit configured to house the optical system; and an attachment member including a holding member configured to hold a face of the subject movably in a state where a peripheral site of the subject's eye is in contact with the holding member, a passing part through which an optical axis of the optical system passes being formed in the holding member, and the attachment member configured to be detachable between the housing unit and the subject's eye.