<p>An endoscope having an insertion unit, comprising an observation optical system (32b) provided at the tip end surface (21) in the insertion-axis direction of the insertion unit (3) and having a wide viewing angle used when the inside of a body cavity is observed, and a plurality of lighting optical systems provided on the axis (33LA) inclined to the insertion-axis (32LA) direction of the insertion unit (3) and used when the inside of a body cavity is illuminated, characterized in that the lighting lens (11) of at least one of the above plurality of lighting optical systems is subjected to light diffusion treatment.</p>
