Problem to be solved: to provide a bracket device of a slide rail assembly having a roof proof function.The bracket device of the slide rail assembly includes a longitudinal wall and a mounting member.The mounting member is movable relative to the longitudinal wall along the height direction of the longitudinal wall.When the bracket device is rotated and switched from the first state to the second state, the mounting member is configured to move from the first position to the second position.When the mounting member is located at the first position, the mounting member can be attached to the rack.When the mounting member is positioned at the second position, the mounting member is prevented from being mounted to the rack.Diagram
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