PROBLEM TO BE SOLVED: To provide a coating amount measuring method capable of accurately measuring a coating amount even if a measurement position is displaced during transportation. SOLUTION: The coating amount measuring method is a coating amount measuring method for measuring the coating amount of a coating material 3 applied by a coating machine 30 to a sheet-shaped substrate 2 to be conveyed. First, the first measurement information indicating the uneven shape of the sheet-shaped base material 2 is acquired in the transport direction on the upstream side of the coating machine 30, and the first unevenness profile of the measurement range set in the sheet-shaped base material 2 is created. One profile creation step and a second profile creation step of acquiring second measurement information indicating the uneven shape of the sheet-shaped base material 2 on the downstream side of the coating machine 30 in the transport direction and creating a second uneven profile of the measurement range. And a coating amount calculation step of calculating a coating amount from the difference between the first measurement information and the second measurement information based on the positional relationship when the shape of the first unevenness profile and the shape of the second unevenness profile are matched. A coating amount measuring method including and. [Selection diagram] Fig. 5
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