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 illumination member is arranged near a first side of the substantially rectangular shape of the imaging region, and each of the second and the third illumination members is arranged near two angles at both ends of a second side of the substantially rectangular shape that opposes to the first side.
