To increase carbonic acid gas concentration without making the inside of an agricultural greenhouse become an excessively humid state.SOLUTION: A feeding device of carbonic acid gas and an agricultural greenhouse equipped with the device comprises: a bubble adding device 2 which adds carbonic acid gas in the state of foam of fine bubbles to create foam water 31； and a spray apparatus having a plurality of nozzles 12 which are arranged in the greenhouse 30 in a dispersed manner and eject the foam water 31 into the greenhouse 30, a feed pump 11 which pressurizes and feeds the foam water 31 to the nozzles 12, and a piping 13 which, while the plurality of nozzles 12 are connected to a discharge side of the pressurizing pump, feeds the foam water 31 to the nozzles 12, in which the spray apparatus 10 pressurizes the foam water 31 obtained by the bubble adding device 2, ejects the water from the plurality of nozzles 12 into the agricultural greenhouse 30 by the feed pump 11, and uniformly feeds carbonic acid gas into the greenhouse 30 via the foam water 31.SELECTED DRAWING: Figure 1【課題】農業用のハウス内を過湿な状態とすることなく、炭酸ガス濃度を高くする。【解決手段】炭酸ガスの供給装置とこれを備える農業用のハウスは、炭酸ガスをファインバブルの気泡の状態で添加して気泡水３１とするバブル添加器２と、ハウス３０内に分散して配置されてハウス３０内に気泡水３１を噴射する複数のノズル１２と、ノズル１２に気泡水３１を加圧して供給する供給ポンプ１１と、加圧ポンプの排出側に複数のノズル１２を連結して、気泡水３１をノズル１２に供給する配管１３とを有する噴霧装置とを備えており、噴霧装置１０は、バブル添加器２で得られる気泡水３１を、供給ポンプ１１で加圧して複数のノズル１２から農業用のハウス３０内に噴射してハウス３０内に気泡水３１を介して炭酸ガスを均一に供給する。【選択図】図１
