To provide a tool for preventing the deformation of a container for baking, which can prevent the unpredicted deformation of the container due to its thermal expansion in baking of dough in the container for baking, can readily be attached to or detached from the container, is inexpensive, and can be used around.

This tool 2 for preventing the deformation of the container 1 for baking, which is fit to the end side of the opening portion of the container 1, is characterized by comprising both approximately rectangular engaging piece portions for detachably nipping and fitting at least the end side from both the sides and a base portion for connecting both the engaging piece portions.

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