To dispense with the labor and the cost for protection and management of vegetation plants, and to ensure the stability of a block itself by forming an earth filling space and a communication passage of the earth filling space with the natural ground in a box-shaped block body whose upper surface is opened, and forming a backfill receiving body on a lower end part on the rear side in rearwardly expanded shape.

A block A for protecting a slope comprises a box-shaped block body 1 whose upper surface is opened, and a backfill receiving body 10 which is rearwardly expanded from a lower end part on the rear side of the block body 1 in an integrated manner with each other by concrete. A longitudinal partition 2 is fitted in the inner space of the block body 1 in a freely inserting manner approximately in the perpendicular direction from the upper surface opening side, and an earth filling space 3 and a discharged water temporary storage space 4 are formed before and behind the longitudinal partition 2. A communication passage 5 to communicate the earth filling space 3 with the natural ground D is formed in a lower part of a rear wall 1a, and a discharged water flow-in hole 6 to flow the underground water in the natural ground D in the discharged water temporary storage space 4 as the discharged water, is formed in an upper part of the rear wall 1a.