To provide a clean cake cutting aid for cutting a circular cake into equal portions finely and easily, which is also suitable for a cake covered with cream.

The cake cutting aid for cutting the circular cake W into equal portions includes a narrow, long center pin 2 and a nearly disk-shaped dividing plate 3, wherein: the center pin 2 includes a narrow introduction portion 4 having a uniform cross-section, a stake 5 having the uniform cross-section and a length different from the introduction portion 4, and a flange portion 6 positioned between the introduction portion 4 and the stake 5, which projects outward from the introduction portion 4 and the stake 5; and the dividing plate 3 includes a through hole in the center through which the introduction portion 4 may be passed, and a plurality of guide grooves cut from a peripheral edge to a vicinity of the through hole, arranged in equal intervals in a circumferential direction.