An image with an expanded depth of field is more effectively acquired while reducing the manufacturing cost, without enlarging the apparatus.Provided is an endoscope system including: an objective optical system that is provided at an insertion portion tip and that acquires a subject image； an optical path division means for dividing the subject image into two optical images with different focuses； an imaging element that forms the two optical images with different focuses at the same time to acquire two images； an image correction means that corrects the two images acquired by the imaging element so that differences other than the focuses become substantially the same； and an image combination processing unit that selects an image with a relatively high contrast in predetermined corresponding areas between the two images corrected by the image correction means to generate a combined image.
