Abstract: The present invention relates to a binoculars having single objective lens. A reflecting mirror transferring means comprising four planar mirrors is used to replace a reflecting mirror transferring means comprising prisms, thus the manufacture cost is greatly reduced. The angle included between two planar mirrors is particularly specified. The feature of the transferring mechanism is ingeniously used by taking a semi-transparent and semi-reflecting mirror as the first planar mirror, so that it serves both functions of image transferring and light splitting, thereby the structure of the product is greatly simplified and the component parts of the product are reduced. At the same time, a second reflecting mirror transferring means having the same structure as that of the first reflecting mirror transferring means and an eye lens are provided behind the semi-transparent, semi-reflecting mirror.