A cooking device for cutting a foodstuff into a prescribed shape. The cooking device includes a cutting portion and a handle attached to the cutting portion. The cutting portion includes a cutting blade and a guide; the cutting blade includes a wave-shaped portion in which trough portions, which recede downward in a direction approaching a foodstuff to be cut, and crest portions, which project upward in the opposite direction to the downward direction, appear alternatively; in the cutting blade, crests, which are the tops of the cutting blade crest portions, and troughs, which are the bottoms of the cutting blade trough portions, appear alternatively; and in the guide, at least a portion of a guide surface, which follows the surface of the foodstuff to be cut, is located between the cutting blade crests and cutting blade troughs in the vertical direction.
