[Object] to provide a spread-fire prevention sheet that is excellent in heat-insulating function and elastically deformable, and a battery including the same. [Solution] the present invention relates to a spread prevention sheet 20 for preventing spread of a fire from one side to the other side in a thickness direction. The spread prevention sheet 20 includes a base sheet 22, one or a plurality of protrusions formed on one surface in the thickness direction of the base sheet 22 and elastically deformable in the height direction, And at least one heat insulating sheet 80 having a higher heat insulating property than the convex portion 21, and a battery including the same. Selected drawing: Figure 5

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