A plant cultivating apparatus 1 has an air-exchange unit 6 that includes an intake unit 61 for taking air into a cultivating chamber R and an exhaust unit 62 for extracting air out from the cultivating chamber R. The intake unit 61 includes: an intake opening 63 an intake door 64 for opening and closing the intake opening 63 an air pump 65 for delivering air toward the cultivating chamber R an upper passage 66 for conducting air to the air pump 65 and a cycling door 67 for opening and closing the upper passage 66. The exhaust unit 62 includes: an exhaust opening 68 and an exhaust door 69 for opening and closing the exhaust opening 68. The air-exchange unit 6 is operable in an air-exchange mode to take air into and expel air from the cultivating chamber R, or in a cycling mode to cycle the air within the cultivating chamber R. By switching between the modes, the plant cultivating apparatus 1 can introduce carbon dioxide into the cultivating chamber R and maintain an uniform gas density, temperature, and humidity within the cultivating chamber R, thereby increasing the efficacy of growth of the plant P.植物育成裝置1係具備由將空氣吸入至育成室R的吸氣單元61、及從育成室R排出空氣的排氣單元62所構成的換氣單元6。吸氣單元61具有:吸氣口63,及開關吸氣口63的吸氣風門64,及向育成室R方向送風的送風機65,及用以將空氣引導至送風機65的上游之通路66,及開關通路66的循環風門67。排氣單元62具有:排氣口68,及開關排氣口68的排氣風門69。換氣單元6是以對育成室R進行吸排氣的吸排氣模式、及使空氣在育成室R內循環的循環模式當中的任一模式來作動的。透過切換此等模式,能將CO2吸入育成室R並且使育成室R內的氣體濃度和溫度、濕度均一化,因而提升植物P的育成效率。1‧‧‧植物育成裝置2‧‧‧外殼3‧‧‧光源4‧‧‧栽培容器5‧‧‧人體偵測感測器6‧‧‧換氣單元8‧‧‧幫浦9‧‧‧水冷單元12、22、23、24‧‧‧孔13‧‧‧空氣濾清器21‧‧‧門30、30a‧‧‧光源收容室61‧‧‧吸氣單元62‧‧‧排氣單元63‧‧‧吸氣口64‧‧‧吸氣風門64a‧‧‧吸氣風門驅動器65‧‧‧送風機66‧‧‧用以將空氣引導至送風機的上游之通路67‧‧‧循環風門67a‧‧‧循環風門驅動器68‧‧‧排氣口69‧‧‧排氣風門69a‧‧‧排氣風門驅動器P‧‧‧植物R‧‧‧育成室
