Plant-culturing tool

1. A plant-culturing tool comprising: a planting container for accommodating a plant;

a water storage container that is capable of accommodating the planting container in an interior thereof and that can store water

the planting container can float on the water when the plant is in the planting container;

and a guide mechanism for causing the planting container to make sliding contact with the water storage container along a floating or sinking direction thereof, so that the planting container is allowed to float up or down, and that the orientation thereof is stabilized,

a water intake aperture being formed in the bottom portion of the planting container to allow water to be drawn from the outside, to the inside of the planting container when the planting container is in a floating state inside the water storage container, the plant-culturing tool characterized in that:

the guide mechanism is composed of a long guide surface having a long sliding portion, and a short guide surface having a short sliding portion that protrudes against the long guide surface, the surfaces making sliding contact with each other; that the short guide surface and the long guide surface are distributed to the planting container and the water storage container respectively and to face each other; and that the guide mechanism is provided at least on an upper part and a lower part of the planting container and the water storage container, wherein each short sliding portion has a length that is less than its corresponding long sliding portion so as to reduce friction that may be produced between two guide surfaces.

2. The plant-culturing tool according to claim 1 characterized by,

a cover member that covers an upper surface of the water storage unit is provided, said cover member having an opening part that allows a peripheral edge of an upper part of the planting container to be inserted in accordance with the floating and sinking movement of the planting container;

a first guide mechanism in which an internal peripheral surface of said opening part is the short guide surface, and in which an external peripheral surface of an upper portion of the planting container is the long guide surface; and

a second guide mechanism in which an external peripheral part of a lower portion of the planting container is the short guide surface, and in which an internal peripheral surface of a lower portion of the water storage container is the long guide surface.

3. The plant-culturing tool according to claim 2 characterized in that the short guide surface or the long guide surface is formed by protruding ribs.

4. The plant-culturing tool according to claim 1 characterized in that the short guide surface or the long guide surface is formed by protruding ribs.