To provide a concrete block with a slope for allowing an animal to creep up on land even if the animal falls in a concrete paved waterway, and promoting propagation of fish by forming a fish nest.

The inclined slope 3 is formed toward the front lower side from a side surface upper part of a concrete block body 1 for opening a front face and an upper surface of a box shape, and a front opening part of this concrete block body 2 is arranged in a side surface opening part 16 of a three-surface concrete paved waterway 18 so that the animal falling in the waterway 18 can creep up on the land from the slope 3.