Endoscope

1. An endoscope comprising:

an operation portion;

an insertion portion provided so as to be pivotable relative to the operation portion;

a rotation knob to be operated when the insertion portion is made to pivot about an axis of the insertion portion relative to the operation portion;

an insertion portion neutral position indicating portion, provided on an outer circumferential face of the rotation knob, configured to indicate a neutral position in a direction in which the insertion portion pivots;

an indication ring, provided at the operation portion, configured to include an operation portion neutral position indicating portion linearly aligned with the insertion portion neutral position indicating portion in a direction of an endoscope rotation axis and indicating that the insertion portion is positioned at a neutral position, and two rotational angle indicating portions each provided so as to be apart from the operation portion neutral position indicating portion in a circumferential direction at a same angle, each of the two rotational angle indicating portions indicating rotation of the insertion portion around the endoscope rotation axis by a predetermined angle,

a leaf spring fixed on a side of an operation portion-side fixed ferrule, the operation portion-side fixed ferrule being integrally fixed to the operation portion, the leaf spring including a sliding protrusion that slides relative to an inner circumferential face of a housing with the rotation knob provided thereon;

angle indicating projection portions protrudingly provided on the side of the operation portion-side fixed ferrule, the angle indicating projection portions being each provided so as to be apart in the circumferential direction at a same angle as with the rotational angle indicating portions; and

a rotary projection portion protrudingly provided on a bisector that, where the insertion portion is positioned at the neutral position, bisects an angle formed by a first line segment connecting a center of one of the angle indicating projection portions and a center on the endoscope rotation axis, and a second line segment connecting a center of another of the angle indicating projection portions and the center on the endoscope rotation axis.

2. The endoscope according to claim 1 , wherein when the insertion portion neutral position indicating portion and the rotational angle indicating portion coincide with each other, the rotary projection portion and the angle indicating projection portion are brought into a predetermined contact state.

3. The endoscope according to claim 2 , wherein if the rotary projection portion includes an elastic member, the angle indicating projection portion includes an elastic member or a rigid member, and if the rotary projection portion includes a rigid member, the angle indicating projection portion includes an elastic member.

4. The endoscope according to claim 1 , wherein

a depression that allows a sliding protrusion of the leaf spring to engage therewith is provided in an inner circumferential face of the housing; and

when the insertion portion neutral position indicating portion and the operation portion neutral position indicating portion are linearly aligned in the endoscope rotation axis direction, the sliding protrusion engages with the depression.

5. The endoscope according to claim 1 , wherein the rotary projection portion and the angle indicating projection portions are provided at respective positions away from the leaf spring in an endoscope axis direction.

6. The endoscope according to claim 1 , wherein at a top face of the rotational angle indicating portion, a recess/projection portion for discrimination between the operation portion neutral position indicating portion and the rotational angle indicating portion is provided.

7. The endoscope according to claim 1 , wherein the operation portion neutral position indicating portion and the insertion portion neutral position indicating portion are colored in respective colors that are different from each other.