An endoscope includes: an insertion portion including, on a distal end portion side, a bending portion that is bendable at least upward and downward； a cylindrical operation portion provided so as to be continuous with a proximal end side of the insertion portion, the operation portion having a first longitudinal axis substantially parallel to a longitudinal axis of the insertion portion and being capable of forming a part of a first grasping portion to be grasped by one hand of a user； a cylindrical extension portion provided so as to be continuous with a proximal end side of the operation portion, the extension portion having a second longitudinal axis extending in a downward bending direction of the bending portion and being capable of forming a part of the first grasping portion and a second grasping portion to be grasped by the one hand； and a bending lever including a first end and a second end, which has a first end portion pivotally provided at the operation portion, and a second end portion provided so as to extend from the first end portion in an upward bending direction of the bending portion, where a finger of the one hand grasping the first grasping portion or the second grasping portion is placed on the second end portion when operation to bend the bending portion is performed.
