Binocular

A binocular, comprising:

• an outer body housing;
• a right lens barrel and a left lens barrel;
• a right telescope system and a left telescope optical system, respectively accommodated in said right and left lens barrels, each of said right and left telescope system having an optical axis parallel to an optical axis direction of the binocular, a lateral direction of the binocular being perpendicular to the optical axis direction and parallel to a plane including both optical axes;
• each of said right and left telescope optical systems including a first movable optical system and a second movable optical system, each of said first and second movable optical systems including optical elements movable along an optical axis direction toward and away from one another so that an image observed is optically changed;
• a first guiding member that guides and moves together optical elements of said first movable optical system of each of said right and left telescope optical systems in the optical axis direction;
• a second guiding member that guides and moves together optical elements of said second movable optical system of each of said right and left telescope optical systems in the optical axis direction;
• an optical arrangement structure that moves said first and second movement member in the optical axis direction, wherein said arrangement structure is disposed between said right and left lens barrels;
• and
• a supporting plate positioned by a predetermined distance in a direction vertically perpendicular to said right and left telescope optical systems, said supporting plate extending in the optical axis direction and in the lateral direction, forming a space between said right and left telescope optical systems and said supporting plate, said first and second movement members being disposed within and moved in the optical axis direction within said space.