An insertion portion, a projecting portion 1 that projects forward from a first distal end surface 10s of the insertion portion, a forward observing lens 7 that is provided to face a second distal end surface 1s of the projecting portion 1, a dual purpose lens 5 that is provided such that a light receiving surface 5j faces an outer peripheral side surface 1vg of the projecting portion 1 along the outer peripheral side surface 1vg of the projecting portion 1, a first forward illuminating lens 12 that is provided to face the first distal end surface 10s, and a light shielding portion 20m that is located on a phantom line Q that linearly connects an end portion 5t at a distal end side of the dual purpose lens 5 and an end portion 12at at an outer side in a diameter direction K in the first forward illuminating lens 12 and prevents incidence of illumination light emitted from the first forward illuminating lens 12 on a light receiving surface 5j of the dual purpose lens 5, are included.
