A distal end portion of an endoscope including a holding portion； a prism holding frame； a cam； a traction member that applies, to the prism holing frame, a first moment of causing the prism holding frame to rotate in one direction through traction； and an elastic member including a secured portion and a pressing portion, the elastic member being configured to generate a second moment in a direction opposite to a direction of the first moment in the prism holding frame using a force applied to the prism holding frame through the pressing of the pressing portion to cause the prism holding frame to rotate in another direction.
