To provide a polishing device for polishing the edges of a glass base board, capable of simply changing a load receptacle in accordance with the size of the glass base board.

The polishing device is composed of a runner 1 to run advancing and retreating with an advance/retreat running means A, a table 7 equipped with a function to attract and hold the load receiving glass base board X installed in the center part of the runner in such a way as revolving with a revolving means B, two base board receiving stages 13 arranged parallel at two confronting edges of the table in such a way as running as approaching and going apart from each other with a guide means, a slide running means E to run the two stages approaching and going apart from each other, and circuit whetstones 21 installed on both sides of the runway for the runner for polishing the peripheral edges of the base board, wherein either of the table and the stages is/are elevated and sunk by an elevating/sinking means.