Relating to a container unit for greening, for example, wall surface and a greening technique using the container unit, this object aims to provide a container unit for greening which can be easily handled, makes it possible to very easily undertake greening of, for example, wall surface within a short period of time, and has a low production cost and a greening technique. A container unit is characterized in that an opening, through which a part of the plant body of a potted plant seedling to be packed in a container unit body can be guided outside, is formed in the one face side of the container unit body in which a planting base such as soil and the potted plant seedling can be packed. Separately from the opening through which a part of the plant body of the potted plant seedling can be guided outside, it is possible to form another opening for packing the planting base and the potted plant seedling in the container unit body.
