PURPOSE: To enable a long square concrete block to confrom to a curve even when connected with reinforcing bars by a method in which the four corners of the concrete block are cut into a triangular form, and a recession is provided in the central part of the long side and a projection having an undulated recession on its upper surface is provided on the front and back sides.

CONSTITUTION: A trapezoidal recession (a) is provided in the central part of the upper and lower long sides of a long square concrete block of uniform thickness. The four corners of the concrete block are cut into a triangular form, and projections (a) are provided on the left and right sides and the upper and lower parts of the block. A projection (c) having a nearly trapezoidal cross section and a wavy upper surface is provided on one or both sides of the central part of the projection (c). The recession (d) is led to a through hole 3 provided in the block body. A revetement block capable of damping the energy of flowing water according to the curved line can thus be obtained.