1. An imaging apparatus comprising: an imaging unit; a closed-eye detection unit configured to detect a face from an image captured by the imaging unit and to detect whether the detected face has closed eyes; and a control unit configured to determine whether to issue a warning about a captured image to be recorded according to a detection result detected by the closed-eye detection unit for the captured image to be recorded and a detection result detected by the closed-eye detection unit for a preview image captured before the image to be recorded is captured, wherein, when closed eyes are detected in all frames, which are set beforehand, of preview images, before a point of time when the image to be recorded is captured, the control unit does not issue a closed-eye warning about the captured image to be recorded, and when closed eyes are not detected in any one of the frames and closed eyes are detected in the captured image to be recorded, the control unit issues the closed-eye warning about the captured image to be recorded.