To provide a greening device which can be easily set up at a variety of places regardless of setting environment.

The greening device 10 is provided with: two thick frames 30a, 30b each having a slanted roof part 310 which has an almost flat rectangular shape and the whole of which is set up so as to form a prescribed angle with the ground, and a support 320 which is set up at the lower-side edge of the slanted roof part 310 to support the roof at a prescribed height from the ground in a cantilevered posture; a planting case 110; and a shelf board 22 on which the planting case 110 is placed. Each of the thick frames 30a, 30b is set up so that the respective higher-side edges 312 of the slanted roof part 310 face to each other in parallel. The shelf board 22 is set up so that the planting case 110 is placed between the respective edges 312 of the respective thick frames 30a, 30b and near the height of the edges 312.