An endoscope is provided with an imaging element having an imaging region of a substantially rectangular shape at an insert part, and includes an observation window provided at a distal end part of the insert part to introduce light from an object to the imaging element and first, second, and third illumination members provided around the observation window on a distal end face of the distal end part to illuminate the object. The first and the second illumination members are arranged near adjoined first and second sides of the substantially rectangular shape respectively, and the third illumination member is arranged near a second angle of the substantially rectangular shape that opposes to a first angle which is an intersection of the first and the second sides.
