An eye gaze tracking apparatus (100) includes: an electro-oculogram measuring unit that outputs an electro-oculogram original signal a calibration index presenting unit (103) that presents a calibration index to a user a saccade detection unit (104) that outputs an electro-oculogram change amount that is an amount of change in an electro-oculogram before or after a saccadic movement which is measured when a gaze-path position of the user moves to the calibration index a calibration parameter calculating unit (105) that calculates a calibration parameter based on a position of the calibration index and an electro-oculogram change amount and a calibration unit (101) that detects the gaze-path direction of the user from the electro-oculogram original signal.
