To realize a low cost as well as to facilitate the layout alteration and the like.

In this pitless slat conveyer 10, plural slat plates 11 are provided continuously along an endless horizontal track, and they are composed to develop on a plane surface. The slat plates 11 are connected each other in a cantilever type by making the inner side of the track as the fulcrums, and guide rails to guide the outer edges of the slat plates 11 are provided. The pit can be eliminated by composing them developing on the plane surface. And by omitting the pit, the processing line can be extended, reduced, moved, changed, and so on, easily and freely.