To provide a wall surface block capable of being freely laid irrespective of any place such as a straight section and a curved section.

A foundation block 20 is constituted by forming an upper side protruding part 21 in an end part 20a on one side in the longitudinal direction and a lower side protruding part 24 in an end part 20b on the other side and forming both of these end parts 20a, 20b into a circular arc shape. This wall surface block 10 having a wall surface part 14 formed and set to length of lateral width being within a scope of length of the straight section in the longitudinal direction of the foundation block 20 is fixed on an upper face of the foundation block 20.