A manufacturing method for a gas discharge display panel includes a disposing step of disposing on a substrate, material of one of an electrode, a dielectric layer, a barrier rib, and a phosphor layer; and a baking step of baking the substrate on which the material has been disposed, while the substrate is carried on a support platform. The support platform has at least one channel in a surface thereof on which the substrate is placed, extending from a covered area covered by the substrate through to an exposed area not covered by the substrate.