1. An image acquiring apparatus comprising: macro image acquiring means for acquiring a macro image of a sample; dark field illuminating means to be used for acquiring a dark field macro image of the sample as the macro image; macro image processing means for processing image data of the macro image to generate a reference macro image; and image pickup condition setting means for setting an image acquiring range corresponding to a range including an object of image acquisition as an image pickup condition of a micro image of the sample by referring to the reference macro image.