PURPOSE:To obtain a device for acclimating a grafted nursery plant having no humidity unevenness in an acclimating chamber, capable of maintaining a high humidity without dehumidifying humidified air with cooled air or heated air. CONSTITUTION:Cooled air or heated air is circulated by a chamber fan 13 only in a space between a double wall (between an outer wall 1 and an inner wall 2) of a wall face of a device for acclimating a grafted nursery plant and the cooled air or heated air is not circulated in an inner chamber 19 charged with a grafted nursery plant. Humidifying fine liquid droplets are evenly sprayed from plural branched pipings 18 only upon the inner chamber 19, a fear of dehumidifying the cooled air or heated air with humidified air in the inner chamber 19 is eliminated and high humidity required for take of the grafted nursery plant is maintained. A humidified air flow is prevented from accompanying the cooled air or heated air flow having an excessive wind velocity. Consequently, occurrence of local difference in humidity is eliminated. Therefore, an environment suitable for promoting take of the grafted nursery plant after grafting can be maintained in the inner chamber 19.
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