In this design, a stopper is mounted on the lower side of one side of a sliding window used for a multi-family house, so that the sliding window is opened from the inside as needed, and the door is opened from the outside so as to prevent intrusion from the outside, The present invention relates to a sliding window opening preventing device for a sliding door. In order to accomplish the above object, the present invention provides a window frame 10 installed in a room of a multi-family house or the like; A sliding window (13) installed on one side of the fixing window (12) installed on the window frame (10) and on the side of the fixing window (12) in a form of a sliding door so as to be able to enter and exit the balcony or the outside; And a stopper 20 mounted on a lower side of one side of the sliding window 13 and fixed and supported to a lower rail 11 of the window frame 10 through a rubber supporting part 21 formed at a lower end thereof, A locking device 30 capable of maintaining an open state and a closed state is provided at an upper portion of the main body 20.
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