Glass plate manufacturing method and glass plate manufacturing device

A method for manufacturing a glass plate includes: a first cutting step of cutting a glass plate by cutting a glass ribbon conveyed while being formed by a first cutting device (2); and a second cutting step in which the glass ribbon (G) is cut by a second cutting device (3) when the first cutting device (2) is not operating. The second cutting device (3) has a holding member (36) that holds the glass ribbon (G), a pressing member (41) that presses the glass ribbon (G) and advances to an advancing end position to apply a bending stress necessary for cutting, and a cutting blade (38) that presses against a bending stress applying portion of the glass ribbon (G). The second cutting step includes a warpage correction step for correcting warpage of the glass ribbon (G) by a warpage correction mechanism (41 (66, 67)) before the pressing member (41) reaches the forward end position (M3). 一种玻璃板的制造方法，包括：第一切断工序，利用第一切断装置（2）将在成形的同时被搬运的玻璃带切断而切出玻璃板；以及第二切断工序，利用第二切断装置（3）在第一切断装置（2）的非运行时将玻璃带（G）切断，所述第二切断装置（3）具有保持玻璃带（G）的保持构件（36