An endoscope system includes: a photoelectric conversion element that subjects an image formed by an optical lens to photoelectric conversion a contour enhancing section that detects an edge component in a picked-up image subjected to the photoelectric conversion, thereby generating a contour enhancement signal an electronic zoom region determining section that determines an electronic zoom region in the picked-up image based on a strength of the contour enhancement signal an instruction section that provides an instruction for enlargement/reduction of the image a parameter setting section that sets a zoom parameter for an electronic zoom section according to the of the instruction section and the electronic zoom section that upon an input of the instruction of the instruction section, performs an electronic zoom of the picked-up image for the electronic zoom region determined by the electronic zoom region determining section, according to the parameter set by the parameter setting section.
