NOVELTY - An automatic performance evaluation apparatus of photocatalyst material has gas mixing container (9) connected to unit (10) to supply low concentration toxic gas, and units to supply air containing moisture and air which does not contain moisture, photocatalytic reaction device (21) connected to unit (14) to transport of low concentration toxic gas, and unit (16) to transport unreacted low concentration toxic gas, measurement unit (18) connected with unit to supply low concentration toxic gas and unit to measure performance of photoreaction catalyst.    USE - Automatic performance evaluation apparatus of photocatalyst material used for purifying air.    ADVANTAGE - The automatic performance evaluation apparatus of photocatalyst material computes performance of photocatalyst material exactly by stably and correctly sampling low flow rate and low concentration gas of target material.    DETAILED DESCRIPTION - An automatic performance evaluation apparatus of photocatalyst material has a gas mixing container (9) connected to an unit (10) to supply fixed quantity of low concentration toxic standard gas, an unit (11) to supply fixed quantity of air which does not contain moisture, an unit (12) to supply fixed quantity of air containing moisture and a supply unit (13) of low concentration toxic standard gas containing air containing constant rate of moisture, a photocatalytic reaction device (21) connected to an unit (14) to transport of low concentration toxic standard gas containing air containing moisture, an unit (15) to induce low concentration toxic standard gas containing the air containing moisture and an unit (16) to transport unreacted low concentration toxic standard gas from reactor, a measurement unit (18) connected to an unit to supply low concentration toxic standard gas, and unit to transport unreacted low concentration toxic standard gas obtained from reactor, and a unit to measure performance of photoreaction catalyst based on amount of low concentration toxic standard gas from calculation result and low concentration toxic standard gas computed from measurement unit.    DESCRIPTION OF DRAWING(S) - The drawing shows the automatic performance evaluation apparatus of photocatalyst material. (Drawing includes non-English language text)    Gas mixing container (9)    Unit to supply fixed quantity of low concentration toxic standard gas (10)    Unit to supply fixed quantity of air which does not contain moisture (11)    Unit to supply fixed quantity of air containing moisture (12)    Supply unit of low concentration toxic standard gas (13)    Unit to transport low concentration toxic standard gas containing air containing moisture (14)    Unit to induce low concentration toxic standard gas containing air containing moisture (15)    Unit to transport unreacted low concentration toxic standard gas (16)    Measurement unit (18)    Solenoid valve (19)    Photocatalytic reaction device (21)