1. An image sensing apparatus comprising an image sensing unit, a red-eye relaxation light projection unit, and an electronic flash unit, characterized by comprising: a control unit which causes the red-eye relaxation light projection unit to execute a red-eye relaxation operation and, after the red-eye relaxation operation, causes the electronic flash unit to project light, said control unit comprising a red-eye determination unit which determines a red-eye size by executing preliminary image sensing during red-eye relaxation light projection by the red-eye relaxation light projection unit, and a processing determination unit which determines, on the basis of a determination result by said red-eye determination unit, whether processing is to shift to image sensing with light projection by the electronic flash unit and whether red-eye relaxation by the red-eye relaxation light projection unit is to be continued.