To provide a flowerpot with automatic water supply equipped with a water storage tank chamber in the interior of the flowerpot and capable of slowly supplying water in the water storage tank chamber through culture soil to a plant by an amount consumed by the plant.

This flowerpot with automatic water supply is obtained by providing an outflow hole 4 in a water storage tank chamber 1, performing the opening and closing of the outflow hole 4 by vertical motion of a float 5 caused by rise and fall of the water level in a water reservoir chamber 2 and automatically maintaining the water level, i.e. the amount of water in the water reservoir chamber 2 constant.