To solve the problem of strength of a cover and the problem of becoming a factor such as damage and noise by looseness due to being impossible for work for applying a gradient to a bottom surface of a drainage ditch since an opening part is narrow, being unusable for flat land having no gradient, and reducing drainage efficiency since it is difficult to arrange a continuous opening part in the cover in a U-shaped groove though a drainage ditch block integrally formed of a body such as a circular and egg-shaped waterway and the cover has advantages having high strength and high drainage efficiency.

This drainage ditch block is formed by arranging the opening part continuing in a narrower width than a maximum width of a drainage space arranged inside in an upper part of the drainage space, and is composed of a body block and a divided block via the opening part by arranging a dividing part reaching the inside drainage space in the longitudinal direction on one side surface.