Manufacturing method for a glass film

A manufacturing method for a glass film, the manufacturing method comprising:

• a cleaving step of separating a glass film having a band shape into a product glass portion and an unnecessary glass portion by successively cleaving, while delivering the glass film in a longitudinal direction thereof by a horizontal conveyance section extending in a horizontal direction, the glass film along a preset cleaving line extending in the longitudinal direction using a thermal stress that is generated along with localized heating performed along the preset cleaving line and cooling performed after the localized heating;
• after the cleaving step, a collecting step of sequentially breaking or shattering the unnecessary glass portion, which is continuously delivered in the longitudinal direction, and collecting the broken or shattered unnecessary glass portion;
• and
• a vibration damping step of damping vibrations of the unnecessary glass portion in a thickness direction thereof after the unnecessary glass portion has been separated from the product glass portion in the cleaving step, by nipping the unnecessary glass portion by a first member contacting a front surface of the unnecessary glass portion and the horizontal conveyance section as a second member contacting a back surface of the unnecessary glass portion in at least one location in the longitudinal direction of the unnecessary glass portion, which is continuously delivered in the longitudinal direction by the horizontal conveyance section, the collecting step being executed on a downstream side of the at least one location of the vibration damping step such that the vibrations generated while the unnecessary glass portion is sequentially broken or shattered in the collecting step are prevented from being transmitted to the glass film present in a cleaving area where the cleaving step is executed, wherein the front surface of the unnecessary glass portion is uncontacted at the cleaving step.