A seat slide apparatus for a vehicle, comprising: a first rail; a second rail slidably movable relative to the first rail; a lock member restricting a movement of the second rail relative to the first rail; a memory member movably supported within an inner void that is formed between the first rail and the second rail in a longitudinal direction of the first rail, the memory member being prevented from moving by an engagement with the first rail; a first holding member fixed to the second rail and holding the memory member so that the memory member is movable along with the second rail in a condition where the restricted movement of the second rail relative to the first rail by the lock member is released in accordance with an operation of an operation handle; a second holding member (60, 80) holding the memory member so as to maintain the engagement between the memory member and the first rail in a condition where the restricted movement of the second rail relative to the first rail by the lock member is released in accordance with a forward tilting movement of a seat back of a seat configured to be fixed to the second rail; a rear holding portion fixed to the second rail in the inner void and supporting one end portion of the second holding member (60, 80) inserted toward one side in the moving direction of the second rail relative to the first rail; and a rail-side engagement portion (47, 86) arranged at the second rail, the rail-side engagement portion (47, 86) being engaged with a holding-member-side engagement portion (67, 85), which is formed at the other end portion of the second holding member (60, 80), and preventing the second holding member (60, 80) from being loosened from the second rail. a first rail; a second rail slidably movable relative to the first rail; a lock member restricting a movement of the second rail relative to the first rail; a memory member movably supported within an inner void that is formed between the first rail and the second rail in a longitudinal direction of the first rail, the memory member being prevented from moving by an engagement with the first rail; a first holding member fixed to the second rail and holding the memory member so that the memory member is movable along with the second rail in a condition where the restricted movement of the second rail relative to the first rail by the lock member is released in accordance with an operation of an operation handle; a second holding member (60, 80) holding the memory member so as to maintain the engagement between the memory member and the first rail in a condition where the restricted movement of the second rail relative to the first rail by the lock member is released in accordance with a forward tilting movement of a seat back of a seat configured to be fixed to the second rail; a rear holding portion fixed to the second rail in the inner void and supporting one end portion of the second holding member (60, 80) inserted toward one side in the moving direction of the second rail relative to the first rail; and a rail-side engagement portion (47, 86) arranged at the second rail, the rail-side engagement portion (47, 86) being engaged with a holding-member-side engagement portion (67, 85), which is formed at the other end portion of the second holding member (60, 80), and preventing the second holding member (60, 80) from being loosened from the second rail.