To provide a masonry material simple substance for simultaneously realizing the following five purposes, while having stable certainty: such as securing sufficient joint strength of a masonry body, securing integration of the masonry body, securing shearing strength of the masonry body, reinforcing a material part of the masonry body, and securing safety when horizontal external force is unexpectedly applied in the middle of construction of the masonry body.

A projection part (a) such as the edge of a pan is formed so as to enclose the whole of a masonry material upper surface. A plurality of recessed parts (c) are formed in a central part formed in a shape such as the pan, and a part (b) having no projection part such as the edge of the pan is formed on its both ends. A bottom expanded-shaped sleeve (d) having an average diameter of about 50 mm and penetrating through a masonry material bottom surface from the masonry material upper surface, is formed in a plurality around a position of 65 mm from the respective material ends when looking at the masonry material in a plan view, or a plurality of projection parts are formed smaller by 5 % to 10 % in the size in a similar figure to the recessed parts of the upper surface on the masonry material bottom surface.