PROBLEM TO BE SOLVED: To provide a concentrated drain type assembly planter securely and efficiently draining water while having convenience because of being an assembly type. SOLUTION: This concentrated drain type assembly planter is composed of a corner member (A), an edge member B and an insole member C. The planter is obtained by adopting such a technical means that a joint member 3 is inserted into an engaged part 22 formed on a side edge opposed surface 21 of each of retaining wall boards 2 of the corner member (A) and the edge member B so as to connect both the accessory moldings with each other, a drain ditch 14a is formed on an opening edge 14 of each of the accessory moldings along the edge and the drain ditches 14a/14a of the accessory moldings being in contact with each other are connected with each other through inserting connecting members 4 thereinto, and at least one corner part 15a of each of the bottom 1 of each of the accessory moldings is cut off so that a fixing hole 15 can project, and water in the planter is concentratedly drained through a drain hole 51 of a drain cap 5 capable of being set in the fixing hole 15. COPYRIGHT: (C)2005,JPO&NCIPI