The invention concerns a sliding window device, comprising a rectangular window frame for mounting in a window section, which is a bottom-side frame (11),a roof-side frame (12) and two lateral frames (13) comprises a window frame in which a first fixed window element (2) and a second variable window element (3) are arranged, the second variable window element (3) comprises a glass pane (4) which is arranged by a circular window insertion (5) is comprised of a bottom-side and a top-side input profile (51,52) and two lateral input profiles (53). In the vertical sections of the circulating glass inlet (5), a horizontal groove is placed on at least one side of the glass pane (4) following the top edge of the bottom-side inlet profile (51), in which one on the bottom-side frame (11) of the window frame (1) is placed, this bottom-side frame (11) Cover plate (8) covering at the same time the top edge of the bottom-side frame profile (11) on this side of the glass pane (4) horizontally.
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