The device is mounted so as not to be exposed to the outside and is viewed from both sides, so that the appearance is good and the manufacturer can diversify the product at an inexpensive cost. In addition, In this case, it is possible to produce an atmosphere similar to a new purchase of an entire tank by replacing only a part of the configuration, so that it is an economical and practical new configuration of a double-sided perspective fishing port.According to the present invention, an inner sidewall member 100 is formed by bending a long-side synthetic resin panel in the longitudinal direction and has a first opening 110 formed on the upper side thereof. The second opening 210 is formed on the upper side and the second opening 210 is formed on the outer periphery of the inner side wall member 110 such that at least a part of the second opening 210 is separated from the inner side wall member 100 An outer sidewall member (200) The inner sidewall member 100 and the outer sidewall member 200 are coupled to the front and rear surfaces of the inner sidewall member 100 and the outer sidewall member 200 to fix the inner sidewall member 100 and the outer sidewall member 200, An auxiliary space 202 for partitioning a portion of the outer sidewall member 200 away from the inner sidewall member 100 from the outside and providing a fishing port peripheral device 2, A first and second transparent plates (300, 400) having a plurality of magnets (310) or metal pieces buried in positions corresponding to the auxiliary space (202) on the outer surface And a cover panel (2) of opaque material which is detachably attached to the outside of the first and second transparent plates (300, 400) by the magnet (310) or the metal piece to cover the auxiliary space (202) 500 and 600 < RTI ID = 0.0 >). 본 고안은 어항 주변장치들이 외부로 노출되지 않도록 장착되고, 양면으로 투시되므로 외관이 미려하고, 제작자는 저렴한 코스트로 제품의 다양화를 꾀할 수 있으며, 소비자들은 어항을 사용하다가 새로운 분위기를 연출하고자 하는 경우에 일부 구성만 교체함으로써 마치 어항 전체를 새로 구입한 것과 같은 분위기를 연출할 수
