1. A contrast sensitivity measuring device comprising: a contrast target display part for displaying contrast targets; a contrast target data determination part for determining contrast targets to be displayed on said contrast target display part according to data on optical characteristics of an eye of a subject to be examined; a contrast target display control part for instructing said contrast target display part to display contrast targets based on contrast target data created in said contrast target data determination part according to a predetermined procedure; and a display part for displaying the results of contrast measurement of said subject using data on a history of responses of said subject to displayed contrast targets.