A coating device and a coating method capable of performing stable coating without causing defects such as a discontinuous coating film even if a web is run at a high speed. The coating device includes: a bar which is in contact with the web and can rotate about an axis; a liquid supply passage which is arranged adjacent to the bar at an upstream side from the bar and supplies a coating liquid to be applied to the web between the web and the bar to form a coating liquid reservoir when the web is being run; and an air-intrusion preventing unit which is arranged at an upstream side from the coating liquid reservoir and produces a liquid flow along a web surface to prevent an accompanying air film produced on the web surface from intruding into the coating reservoir when the web is being run.