OPTICAL SWITCH

An optical switch which comprises an optical fiber arrangement member to which free end portions of a plurality of first optical fibers are fixed, a movable arm opposed to the optical fiber arrangement member and securing free end portion of a second optical fiber, and a driving means for switching the optical connection by driving the optical fiber arrangement member and/or the movable arm in the direction of arrangement of the first optical fibers and in the direction perpendicular to the mentioned direction so as to optically connect the second optical fiber to the first optical fibers. The optical fiber arrangement member and movable arm are housed in a sealed case, in which an optical reflection preventing agent is sealed.