A glass plate manufacturing apparatus which forms a glass ribbon by continuously supplying molten glass to a bath surface of a molten metal bath, and carries the glass ribbon forward along the bath surface, the apparatus comprising: a plurality of pairs of top roll bodies configured to support end portions in a width direction of the glass ribbon; a plurality of heaters provided in a predetermined heater area above the glass ribbon; and a plurality of controllers, wherein the heater area is divided to a plurality of rows arranged along a conveying direction of the glass ribbon, wherein one or more of the heaters are provided in each subarea obtained by sectioning each of the rows in the width direction of the glass ribbon, wherein the heater(s) within the respective subarea are collectively controlled by one of the controllers, which is provided corresponding to the subarea, wherein a boundary between every two adjacent rows is taken as a dividing portion and a boundary between every two adjacent subareas in each of the rows is taken as a sectioning portion, wherein at least one discontinuous point is present between sectioning portions in one of two adjacent rows in the heater area located between the mostupstream pair of the top rolls and the mostdownstream pair of the top rolls, wherein each of the controllers is configured by a microcomputer; and wherein in the heater area located between the mostupstream pair of the top rolls and the mostdownstream pair of the top rolls, the subareas are provided along a predetermined curved flow line of the glass ribbon and any of two or more consecutive rows among the plurality of rows are sectioned in the width direction so that the flow line passes under said subarea, wherein the predetermined curved flow line of the glass ribbon is a flow path through which a predetermined part located in the width direction of the glass ribbon steadily passes. a plurality of pairs of top roll bodies configured to support end portions in a width direction of the glass ribbon; a plurality of heaters provided in a predetermined heater area above the glass ribbon; and a plurality of controllers, wherein the heater area is divided to a plurality of rows arranged along a conveying direction of the glass ribbon, wherein one or more of the heaters are provided in each subarea obtained by sectioning each of the rows in the width direction of the glass ribbon, wherein the heater(s) within the respective subarea are collectively controlled by one of the controllers, which is provided corresponding to the subarea, wherein a boundary between every two adjacent rows is taken as a dividing portion and a boundary between every two adjacent subareas in each of the rows is taken as a sectioning portion, wherein at least one discontinuous point is present between sectioning portions in one of two adjacent rows in the heater area located between the mostupstream pair of the top rolls and the mostdownstream pair of the top rolls, wherein each of the controllers is configured by a microcomputer; and wherein in the heater area located between the mostupstream pair of the top rolls and the mostdownstream pair of the top rolls, the subareas are provided along a predetermined curved flow line of the glass ribbon and any of two or more consecutive rows among the plurality of rows are sectioned in the width direction so that the flow line passes under said subarea, wherein the predetermined curved flow line of the glass ribbon is a flow path through which a predetermined part located in the width direction of the glass ribbon steadily passes.