To uniformly sprouting to a mixed gas of carbon dioxide and ethylene vegetables during cultivation.

This plant culture apparatus 1 cultivates small bean sprouts of sprout vegetable by assembling an inner frame 2 of culture box, a porous board 3 of bottom part and an outer frame 4 of the culture box to form the culture box and laying a medium body 10 inside the culture box. The inner frame 2 of the culture box is constituted by arranging side plates 21, 22, 23 and 24 of four planes equipped with plural gas passing holes 20 in a frame shape. The side plates 21, 22, 23 and 24 are connected by hinges 25. The porous plate 3 of bottom part is obtained by forming plural gas passing holes 30 also useful as drain openings on a plate member and the medium body 10 is laid on the top of the porous plate. The outer frame 4 of culture box is formed in a frame shape and is equipped with a seizing part 41 for seizing the inner frame of culture box and the porous plate of bottom part in an inserted state of the inner frame 3 and the porous plate of bottom part from above.