1. A line of sight detection device calibration method, which calibrates a line of sight detection device that measures movement of an eyeball of a subject wearing eyeglasses and detects a transmission point at which a line of sight of the subject passes through a lens of the eyeglasses based on a result of measurement, the method comprising: a measurement step of measuring the movement of the eyeball of the subject in a condition in which a first baseline is arranged at an outer peripheral part of the lens of the eyeglasses and a corner cube at which the subject gazes is adjusted such that the first baseline reflected in the corner cube substantially corresponds to a second baseline of the corner cube; and a calibration step of calibrating the line of sight detection device based on a result of measurement by the measurement step, wherein the second baseline is at least one of a ridgeline of the corner cube and a reflected image of the ridgeline.