1. An image pickup device comprising: an image pickup unit that obtains two picked-up images of a same object with respective optical axis positions being different from each other; a finder image selecting unit that selects either one of the two picked-up images as a finder image; a finder display unit that displays the finder image selected by the finder image selecting unit on a finder screen; a feature detecting unit that detects features of the two picked-up images; an abnormality determining unit that determines in which picked-up image in the two picked-up images an abnormality is present based on the features detected by the feature detecting unit; and a warning unit that makes a warning regarding an abnormality when the abnormality determining unit determines that the abnormality is present.