PROBLEM TO BE SOLVED: To provide a sound absorption plate unit that reduces an unnecessary member to be a conventional sound absorption member to attain weight reduction and cost reduction, can easily perform position alignment in a case of being installed, and attains space saving when plural cell-shaped sound absorbers are conveyed.SOLUTION: By connecting four sound absorption plates 3 arranged in a line at three adjacent parts with rotatable connection members 5, the sound absorption plates can be arranged in one line, or can be folded with the two sound absorption plates as one pair. The sound absorption plate has an internal space filled with an absorption material 3b, and a part of the surface thereof is covered with an outer frame plate 3a.
