To reduce wear of a guiding conveyance body such as a chute guiding powder and grain such as fresh concrete.

Shelf members 2 blocking movement of a part of the fresh concrete 10 every predetermined interval are provided on a bottom wall 1a of the oblique chute 1. A portion receiving impact by dropping fresh concrete 10 is provided as a double wall part 3. Even when a first bottom wall is worn and a hole is opened, an accumulating part is formed by the double wall part 3 and subsequent wear is reduced. The impact by the dropping fresh concrete 10 is eased by the accumulating part of the double wall part 3 and wear is reduced. A layer or curtain is formed on a bottom wall 1a surface by the fresh concrete 10 with movement blocked by the shelf members 2, and by this, wear of a sliding face of the chute can be reduced.