PROBLEM TO BE SOLVED: To provide a sheet fixation structure of a daylighting roof such that even an inexperienced worker can easily fit a sheet material.SOLUTION: A sheet fixation structure of a daylighting roof 1 includes: a daylighting member 10a arranged at an opening part of the roof; a flexible sheet material 11a arranged below the daylighting member 10a substantially in parallel with a daylighting surface of the daylighting member 10a; a sheet material fixation member 24a having a groove part 241a; and a sheet press-in member 25a which is pressed in the groove part together with the sheet material so as to fix the sheet material to the sheet material fixation member.