To fix a slicer stably to a container either of horizontally and obliquely so as to prevent sliced food from protruding from the container.

The slicer includes a blade body; a plate-like body having a slice face which slices food using the blade body while sliding, and a pair of edges erected so as to face each other along a food slice direction at a back side which is an opposite side of the slice face of the body; and at the back side, a supporting portion which is composed of a convex portion positioned between the pair of the edges and a pair of notches positioned at both sides of the convex portion and formed by notching the pair of edges is provided.