1. An analysis method for analyzing an anterior ocular segment tomographic image of an eye to be inspected, the analysis method comprising: a baseline determining step of determining a baseline corresponding to an inner surface of a cornea and an inner surface of a sclera of the anterior ocular segment in the anterior ocular segment tomographic image; an approximated curved line determining step of determining an approximated curved line that approximates a shape of an anterior surface of an iris of an anterior ocular segment of the eye to be inspected, corresponding to the anterior surface of the iris in the anterior ocular segment tomographic image; an extended curved line determining step of determining a curved line extended part obtained by extending the approximated curved line until the approximated curved line crosses the baseline; a position calculating step of calculating a position at which the curved line extended part crosses the baseline; and a value calculating step of calculating a chamber angle parameter value of the anterior ocular segment based on the calculated position at which the curved line extended part crosses the baseline.