To provide an air conditioner of a greenhouse (greenhouse such as a plastic house and a glass house) for cultivating fruits and vegetables, root vegetables and other vegetables, in details, intended for improving efficiency of air conditioning (improving efficiency of cooling and heating and/or air-conditioning in the greenhouse), resources saving, or effectively using equipment and materials.

This air conditioner of the greenhouse is such that equipment and materials for producing air curtain of air-conditioning equipment are arranged in the ceiling part and space part of the greenhouse, and air curtain is produced when required near the equipment and materials for cooling and heating in the greenhouse of the lower side of the air curtain. As a result of this, it is possible to improve efficiency of cooling and heating and/or save energy with the air curtain through setting the air-conditioning equipment on the vicinity or line of a beam in the longitudinal direction and/or the crosswise direction of the greenhouse.

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