thereto the invention may be configured such that the temperature of the surface outside the defibrating unit 30 is measured in addition the invention may have a configuration in which the second thermometer 114 and the third thermometer 115 measure the temperatures of the surface outside the upstream transporting path 25 and the downstream transporting path 35 in the same manner also in this manner the temperature changes of the respective portions can be easily acquired such that the same effect can be obtained according to the embodiment described above the first thermometer 113 the second thermometer 114 and the third thermometer 115 are provided as the temperature acquiring unit 110 but the invention is not limited to this configuration if three thermometers are used while the temperatures inside the defibrating unit 30 are obtained the rising state of the temperature of the defibrated materials in the defibrating unit 30 can be obtained by the temperature differences between the upstream and the downstream of the defibrating unit 30 however only the temperature in the defibrating unit 30 may be obtained only with the first thermometer 113 in addition the temperature difference between the upstream and downstream of the defibrating unit 30 may.