To provide an inexpensive apparatus for growing an aquatic plant, which enables a light source for irradiating the aquatic plant with light to be made small, and facilitates removal and rearrangement of the aquatic plant from and in an aquarium.

The apparatus for growing the aquatic plant is constituted so that a container in which the aquatic plant is planted may be rotated relative to the light source. In the rotation, the device is constituted so that the power transmission between the container and an external power system can be carried out indirectly without a power shaft.