A visual field measuring method in which standardized test symbols are sequentially displayed at a display to measure visual field, the visual field measuring method comprises: a reference standardized symbol display operation in which a standardized test symbol is displayed at a reference location provided at a center of the display; a reference input operation in which a test subject is made to input the fact that the standardized test symbol displayed at said reference standardized symbol display operation has been recognized; a peripheral standardized symbol display operation in which, following the input of the fact that the standardized test symbol was recognized at said reference input operation, a standardized test symbol is displayed at a location different from the reference location; a peripheral input operation in which the test subject is made to input the fact that the standardized test symbol displayed at said peripheral standardized symbol display operation has been recognized; and wherein from the reference standardized symbol display operation to the peripheral input operation is executed in repeated and sequential fashion, a response time from when the standardized test symbol is displayed at the peripheral standardized symbol display operation to when the input is performed by the test subject at the peripheral input operation is measured, and wherein the visual field measuring method being characterized in that a best-fit line is obtained by performing linear approximation on a graph plotting the response time in such fashion that offset information pertaining to the standardized test symbol displayed at the peripheral standardized symbol display operation is plotted on a horizontal axis and the response time is plotted on a vertical axis. a reference standardized symbol display operation in which a standardized test symbol is displayed at a reference location provided at a center of the display; a reference input operation in which a test subject is made to input the fact that the standardized test symbol displayed at said reference standardized symbol display operation has been recognized; a peripheral standardized symbol display operation in which, following the input of the fact that the standardized test symbol was recognized at said reference input operation, a standardized test symbol is displayed at a location different from the reference location; a peripheral input operation in which the test subject is made to input the fact that the standardized test symbol displayed at said peripheral standardized symbol display operation has been recognized; and wherein from the reference standardized symbol display operation to the peripheral input operation is executed in repeated and sequential fashion, a response time from when the standardized test symbol is displayed at the peripheral standardized symbol display operation to when the input is performed by the test subject at the peripheral input operation is measured, and wherein the visual field measuring method being characterized in that a best-fit line is obtained by performing linear approximation on a graph plotting the response time in such fashion that offset information pertaining to the standardized test symbol displayed at the peripheral standardized symbol display operation is plotted on a horizontal axis and the response time is plotted on a vertical axis.