An apparatus for measuring a sighting direction of human eyes includes: a camera oriented toward an eye and picking up images thereof with invisible light, a first light source coaxially installed with the camera and emitting the invisible light toward the human eye, a second light source installed apart from said first light source and emitting invisible light toward the human eye, a calculator for calculating an expression of a line via the center of the pupil, an expression of a line via the position of the reflection of the first light source, and an expression of a line via the position of the reflection of the second light source, according to the images of the eye, calculating the position of the center of the corneal sphere according to the expressions of the lines via the positions of the reflections of the first and second light sources, and calculating the sighting direction of the eye according to an expression of a line via the center of the pupil obtained and the center of the corneal sphere of the eye.