The plant cultivation device which workability of cutting of the leaves of the plant at the base portion thereof from the root portion of the plants. The plant cultivation device includes a culture medium holding portion in a cylindrical shape, accommodating and holding a seedling culture medium, arranged in the through-holes of the fluid passage member and absorbing the culture fluid into the seedling culture medium and a leaf supporting portion formed in a cylindrical shape, arranged at an upper side of the culture medium holding portion and supporting the leaves from around the leaves which are cultivated from the seeds. The culture medium holding portion and the leaf supporting portion are formed such that a cutting tool, used for separation between the seedling culture medium and the leaves, can be insertable from outside into a bordering portion between the culture medium holding portion and the leaf supporting portion.