To provide a greening unit allowing natural rain, sunshine and air to easily thoroughly spread on a perpendicular plane of a building wall surface and a road soundproof wall without the need of a means such as a water sprinkling device, and retaining a plant while preventing culture soil collapse.

The planting culture soil container unit 7 is composed of a frame body 6 whose at least upper surface and front are opened in a set condition, and a plurality of containers 1 which have each a planting surface 5 on the surface and are put side by side at prescribed intervals in space S of the frame body 6. The unit adopts a structure that each the container 1 is fixed to the frame body 6 in a condition of inclining the planting surface 5 when viewing the frame body 6 from the front side.