To provide a sound absorption structure of a road which has hardly influence on the location or use of a site and which can be inexpensively executed.

coarse aggregates are connected to each other in a condition that the surfaces thereof are coated with a binder and a plurality of porous boundary blocks 3 of the road made of porous concrete having continuous voids in the inside are laid to arrange along the boundary between a roadway 1 and a sidewalk 2 or the boundary between the roadway 1 and a medial strip.