A line-of-sight detection apparatus includes a processor, and a memory storing a program which, when executed by the processor, causes the line-of-sight detection apparatus to function as a line-of-sight detection unit configured to detect a position of a line of sight of a user with respect to a display unit, a subject detection unit configured to detect a subject from an image displayed in the display unit, and a correction value determination unit configured to determine a correction value used by the line-of-sight detection unit such that the position of the line of sight detected by the line-of-sight detection unit matches a position of the subject detected by the subject detection unit.