Problem to be solved. To provide a coating device capable of accurately producing a calibration curve. Solution. The coating device includes: a measurement part for measuring the physical properties of particulate particles of a particulate layer S inside a rotary drum 1; and a sampling part 6 for collecting a part of the particulate particles from the particulate layer S. The measurement part has a translucent member 5a installed in a rear end wall part 1c of the rotary drum 1, and an optical sensor for measuring the physical properties of the particulate particles of the particulate layer S via the translucent member 5a. The sampling part 6 has a particle collection part 6a installed in the rear end wall part 1c of the rotary drum 1. The particle collection part 6a is installed in a position to be a rear side in a rotation direction relative to the translucent...

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