Disclosed in the present invention is a bidirectional damper for a shower door, comprising a mounting frame, a tension spring, a damping cylinder, a first coupling member, a second coupling member and two clamping members. The cylinder body of the damping cylinder is a dual-cavity cylinder body; the two cylinder cavities of the dual-cavity cylinder body are arranged in parallel; the axes of the two cylinder cavities are parallel to each other, and the directions of cavity openings are opposite; the two cylinder cavities respectively correspond to a first piston rod and a second piston rod; the first piston rod and the second piston rod are parallel to each other; or the damping cylinder is formed by two separate parallel cylinder bodies arranged side by side with heads being adjacent to tails; the two cylinder bodies respectively correspond to the first piston rod and the second piston rod; the first piston rod and the second piston rod are parallel to each other.

A control arm includes a first and a second arm section pivotably connected to each other. A control part is coupled to the first arm section and includes a control surface. A thrust piece is mounted on the second arm section and includes a counter control surface. At least one spring element biases the thrust piece relative to the control piece. The arm sections are pivoted relative to one another and the relative movement between the control part and the thrust piece is a rolling movement.