Provide endoscopic system, wherein the depth of field be broadened and it is a kind of can obtain high quality have aberration correction advantageously.Endoscopic system includes objective lens optical system OBL, optical path splitting unit 20, cutting object image obtains, by being divided into two optical imagerys with focus to object optical system OBL, image pickup element 22, obtain optical imagery, processing part 23c is synthesized with image, the image that there is relatively high contrast in presumptive area is selected to obtain from two optical imagerys, with generation composograph, the OBL of the objective lens optical system includes the first lens L1, it is near object with negative refractive power, meet the following conditions expression formula (1) and (2) with endoscopic system. 3< d_diff/im_pitch& lt 1000.005< d_diff/r1_r& lt 1.0place, D_diff indicate air characteristic chamber length optical path length two optical imagerys, im_pitch indicate pel spacing photographing element connection, andR1_r indicate radius of curvature the first lens image side surface have negative refractive power.
