The present invention relates to a braking device using a braking bar, comprising: a braking head including a braking bar capable of moving downward to press a surface of a glass panel and extending in a direction perpendicular to a feeding direction of the glass panel; And a supporting unit provided on the front and rear sides of the breaking bar with respect to a conveying direction of the glass panel, wherein a lower end of the supporting unit is positioned on an upper surface of the glass panel before the breaking bar is lowered and contacts the glass panel And presses the key. Thereby, even if there is a vacuum pattern on the glass panel or a part where the attraction force is lowered, the breaking work can be performed smoothly without fail.
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