Glass film cleaving method and glass film laminate

A glass film cleaving method, comprising:

• a full-body cleaving step of cleaving a full-body of a glass film having a thickness of 200 μm or less by propagating an initial crack along a preset cleaving line through laser heating of the glass film followed by subsequent cooling of the glass film;
• and
• a laminate manufacturing step of manufacturing a glass film laminate by setting a surface roughness Ra of each of a surface of the glass film to be brought into contact with a support glass, which is configured to support the glass film, and a surface of the support glass to be brought into contact with the glass film to 2.0 nm or less, and by bringing the surface of the glass film and the surface of the support glass into surface contact with each other, followed by the full-body cleaving step.