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We describe the scheme and design features of the new IFU unit (IntegralField Unit) meant to perform integral-field spectroscopy as a part of SCORPIO-2focal reducer, which is mounted in the prime focus of the 6-m telescope of theSpecial Astrophysical Observatory of the Russian Academy of Sciences. Thedesign of the unit is based on the principle of the formation of array spectrausing a lens raster combined with optical fibers. The unit uses a rectangularraster consisting of 22x22 square 2-mm diameter lenses. The image of the objectis transferred by an optical system with a 23x magnification from the focalplane of the telescope to the plane of the lens raster. The image scale is0.75"/lens and the field of view of the instrument has the size of 16.5"x16.5".The raster also contains two extra 2x7 lens arrays to acquire the night-skyspectra whose images are offset by $\pm$3' from the center. Optical fibers areused to transform micropupil images into two pseudoslits located at the IFUcollimator entrance. When operating in the IFU mode a set of volume phaseholographic gratings (VPHG) provides a spectral range of 4600-7300 \AA\ and aresolution $\lambda/\delta\lambda$ of 1040 to 2800. The quantum efficiency ofSCORPIO-2 field spectroscopy is 6-13% depending on the grating employed. Wedescribe the technique of data acquisition and reduction using IFU unit andreport the results of test observations of the Seyfert galaxy Mrk 78 performedon the 6-m telescope of the Special Astrophysical Observatory of the RussianAcademy of Sciences.

IFU Unit in SCORPIO-2 Focal Reducer for Integral-Field Spectroscopy on the 6-m Telescope of the SAO RAS