We investigated the detailed mechanism of the unusual wetting of liquid metal bismuth on the surface ne crevice structure of copper metal created with laser-irradiation by focusing on the wetting state during the course of wetting. It was observed that liquid bismuth in ltrates into the ne pore and the interspaces on the surface ne porous structure, and wets on the surface ne crevice structure itself ahead and behind the wetting front, respectively. This revealed that the unusual wetting on the surface of the ne crevice structure proceeded through a transition from microscopic wetting to macroscopic wetting.