The present invention relates to a folded optical instrument.;The present invention is the eyepiece frame (1) formed with a tube holder for holding the eyepiece zone and two folding tubes (31,32) spaced at a constant width to maintain the distance between the two eyes, and see the object through the lens A lens frame body 2 for coupling the objective lenses 51 and 52 so as to maintain a constant binocular width and fixing two folding tubes 31 and 32, between the eyepiece frame 1 and the lens frame body 2; It is to provide a folding optical device consisting of a folding tube (31,32) that is installed in the bellows-type folding action.;The present invention can provide a portable telescope or a variety of play optical instruments simply folded in a slim form and can be portable and easy to use.
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