To provide a block for the simple execution of works being lightweight and being not rotated when the block is stacked and a rack suitable for gardening using the block.

Cavity sections 2 and through-holes 3 are formed so as to connect the top face and underside of the block 1 while indented sections 4 are formed to the top face of the block 1. The blocks 1 are stacked at multistages and used as supports 7, and the rack 9 for gardening is constituted by stretching shelf boards 8 among a plurality of the supports 7, 7. The indented sections 4 are arranged so as to be placed on the underside side only in the block 1 at a lowermost stage. Wires are passed through the through-holes 3 of the blocks 1 configuring the supports for mutually coupling the blocks 1, wedge stoppers are inserted and attached at both upper-lower tips of the wires, and the wires are tensed. The wedge stoppers are arranged into the indented sections 4.