Provided is a plant cultivation device whereby space saving can be attained particularly at the early growth stage while preventing leaves from dropping in the grown state. The plant cultivation device (1) comprises: first plate parts (52) that are shaped into a plate extending in the conveyance direction from flow channel members (41) and second plate parts (53) that are shaped into a plate extending in the opposite conveyance direction from the flow channel members (41). As the distance between the flow channel members (41) adjacent to each other becomes shorter the second plate part (53) provided in the preceding flow channel member (41) vertically superposes on the first plate part (52) provided in the following flow channel member (41). As the distance between the flow channel members (41) adjacent to each other becomes longer the second plate part (53) provided in the preceding flow channel member (41) is separated apart in the conveyance direction from the first plate part (52) provided in the following flow channel member (41).
