To provide surface material used for a ceiling or wall in an air conditioning system with air blast from the ceiling or wall, capable of satisfactorily diffusing, straightening cool or warm air locally fed from a blowout duct in the rear of the surface material and equally and efficiently sending the cool or warm air all over a room without causing a human body to feel an unpleasant wind.

The surface material 1 for the ceiling or wall is used in the air conditioning system 2 which cools or warms an indoor space by sending air in the room through the ceiling or wall in the indoor space of a building. The surface material 1 is formed of fiber sheet substance having an opening rate of 0.2-35% and air permeability of 40-650 cc/cm2sec.