To provide a water permeable block material for maintaining superior water permeability even by long-term use, and to provide a manufacturing method for the water permeable block material for effectively using waste.

A passing through part 20 reaching a reverse 13 side large hole part 16 from a surface 12 side small hole part 15 is formed inside a block body 11. Waste mud and a waste fine grain material are used as a main raw material, and cement, a hardener and required water are mixed and kneaded in this raw material. A block body 30 is obtained by extrusion molding while deaerating this mixture by vacuum suction. A passing through part forming member 50 is brought into pressure contact with the block body from the reverse side, and a passing through part 40 is formed so as to reach a reverse side large hole part 36 from a surface side small hole part 35, and is then dried without baking.