To provide the connection structure of a decorative sound absorption louver easily and surely performing connection working and effective in holding quality.

Length necessary for the mutual butt connection of the sound louver is possessed in a shape capable of insertion in the inner side in the lateral cross section shape of the decorative hole opened sound absorption louver, an opening seeing through a plurality of the sound absorption hole of the sound louver is provided, and a joint sleeve providing a fixing slot is used on a side wall or a bottom wall. One end side of the joint sleeve is fitted to the end opening of one sound absorption louver, the sound absorption hole formed on the side wall or the bottom wall of the sound absorption louver and the fixing slot of the joint sleeve are matched to be riveted, and the other end side of the joint sleeve is fitted to the end opening of the other sound absorption louver to perform butt connection.