Abstract: A cutting board includes a main body provided with a first plane and a second plane of N-gon shape (N is an integer not less than 4), the first plane and the second plane being mutually disposed at front and back. The main body includes: a first wall projecting towards the first plane side from at least a part of a first side connecting a first vertex and a second vertex disposed adjacently of the main body; a second wall projecting towards the first plane side from at least a part of a second side extending from the first vertex in a direction which is different from the second vertex; a third wall projecting towards the second plane side from at least a part of a third side, the third side connecting a third vertex that is farthest from the first vertex to a fourth vertex that is farthest from the second vertex; and a fourth wall projecting towards the second plane side from at least a part of a fourth side extending from the third vertex in a direction which is different from the fourth vertex.