PURPOSE: To provide an outside hanging type filtration device that is hung outside a wall surface of an aquarium in which the water in the aquarium is made to flow throughout a filtering medium in a filtration device body, and thereby the efficiency of filtration is increased.CONSTITUTION: A pump unit P is detachably supported in a central part in the horizontal direction of a filtration case FC. Left and right filter chambers 17 are formed in both sides of left and right, and are freely inserted in left and right filtration units FU in the left and right filter chambers 17, respectively. The water from the pump unit P is made to diverge from the central part in the horizontal direction of the filtration case FC into the left and right filter chambers 17, and is filtered by a filtering medium 40 of the left and right filtration units FU.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【目的】 本発明は、水槽の壁面に外掛けする、外掛け式濾過装置において、水槽内の水が濾過本体内の濾材の全域に行き渡るようにして、濾過能率を高めるようにした。【構成】 濾過ケースFCの左右方向の中央部に、ポンプユニットPを着脱可能に支持し、その左右両側に左右濾過室17を形成し、その左右濾過室17内の左右濾過ユニットFUにそれぞれ抜差自在に挿入し、ポンプユニットPからの水を濾過ケースFCの左右方向の中央部から左右濾過室17内に分流して左右濾過ユニットFUの濾材40により濾過するようにした。【選択図】 図3