A capsule endoscope can prevent any fall of the efficiency of observation by reducing the substance or substances adhering to the outer surface of the front end cover such as food residue and mucus. The capsule endoscope includes a dome-shaped front end cover provided on the outer surface with photocatalytic coating, an image pickup means arranged in the front end cover to pick up images of the inside of an object of examination into which the endoscope is introduced and acquire image information on the inside of the object of examination and a lighting section arranged around the image pickup means within the dome-shaped front end cover.