To simplify execution and to improve adhesion strength.

When substrate mortar is not used for the wall surface of concrete 1 and a tile 4 that has a size of at least a tile for hooking three tiles and is equal to or less than 500 g in weight is directly stuck via sticking mortar 3, a nozzle head where a plurality of unit nozzles in which a nozzle diameter ranges from 0.05 to 0.5 mm are open at different positions on the front is retained by a holder so that it continuously moves around a rotary axis center that deviates from the axis center as pretreatment for the wall surface. Further, fuel injection equipment is used, where the deviation relation of the axis center to the center of the revolution of the nozzle head is in a relation in which a locus shown by the unit nozzle performs lapping regarding a direction for orthogonally crossing a travel direction by the travel of the nozzle head. High-pressure water is projected from each unit nozzle to the wall surface and a holder is moved, and surface-roughening is performed to form a shallow groove as a projection locus in connection with the projection of the high-pressure water on the wall surface.