To provide a new coating method for carrying out mat coating for a sheet-type infinite form material to give excellent coating quality and high cost efficiency.

Operation of a film width end position alteration means 38 for independently altering the positions of both ends in the width direction of a coating film 32 to be poured from a head unit 20 by shutting the coating film 32 from both sides in the width direction is controlled based on the detection result of width direction end position detection means 56 for detecting the positions in both ends of a sheet-type infinite form material 12 in the width direction, so that the positions of both ends in the width direction of the coating film 32 can be adjusted in accordance with the positions of both ends of the sheet-type infinite form material 12 in the width direction.