An apparatus for cultivating plants may include a cabinet having an interior space, a door to open or close the interior space, at least one bed provided in the interior space and used to cultivate the plants, at least one light assembly to irradiate the at least one bed with light for photosynthesis, a water tank to store water to be supplied to the at least one bed, and a machine compartment provided at a lower portion of the cabinet, and separated from the interior space to communicate with an ambient surrounding, a compressor and a condenser being provided in the machine room to adjust a temperature of the interior space. The water tank may be provided inside the interior space spaced apart from the machine compartment.