PROBLEM TO BE SOLVED: To provide an automatic water supply device for flowerpot, surely performing automatic water supply operation, reduced in size and conveniently designed.SOLUTION: This automatic water supply device 1 for a flowerpot includes: a water storing tank 3 formed in a closed state in the periphery of a flowerpot storing part 2 a water supply mechanism including a cylindrical support 6 provided on a base plate 2a of the flowerpot storing part 2 to communicate with the water storing tank 3 and a water supply pipe 9 rotatably screwed to the cylindrical support 6 a communicating pipe 17 disposed in the water storing tank 3 to communicate an air circulating port 15 opened to a water collecting part 13 provided at the bottom of the flowerpot storing part 2 with an upper space in the water storing tank 3, and configured to stop supply of water to the flowerpot storing part 2 when a lower end inclined opening surface is sunk in water and a pumping member 20 provided in the water collecting part 13 with the tip thereof projected above the bottom of the flowerpot storing part 2 to thereby move the water from the terminal to the tip.COPYRIGHT: (C)2012,JPO&INPIT【課題】確実な自動給水動作をなすとともに、小型化が可能で使い勝手の良い植木鉢用自動給水器を提供する。【課題の解決手段】植木鉢用自動給水器1は、植木鉢収容部2の周囲に閉塞形成した貯水タンク3と、植木鉢収容部2の底板2aに貯水タンク3と連通するよう設けた円筒支持体6、及び円筒支持体6に回転可能に螺合する給水パイプ9からなる給水機構と、植木鉢収容部2の底部に設けた水溜まり部13に開口した空気流通口15と貯水タンク3の上部空間を連通すべく貯水タンク3内に配設され下端傾斜開口面が水没すると植木鉢収容部2への給水が停止される連通パイプ17と、先端が植木鉢収容部2の底部より上方へ突出するよう水溜まり部13に設けて、水を末端側から先端に向けて移動させる揚水部材20を備えてなる。【選択図】図4