To produce a phenolic resin foam of high quality, stably for a long time while improving a curing rate of it.SOLUTION: The method includes the steps of: mixing a phenolic resin, paraformaldehyde, a foaming agent, and an acidic curing agent containing an organic acid, with a mixer, to obtain a foamable phenolic resin composition; and discharging the foamable phenolic resin composition onto an undersurface material.SELECTED DRAWING: Figure 1

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