To provide aquarium cleaner that can clean the corners around the tank wall. A cleaner body 2 is placed in the tank, is located outside the tank, tank cleaners of the present invention includes, a magnetically attractable outside the operating member 5 the cleaner body 2. A parallel state with the oscillator 3 of the right pair, the oscillator 3 of the pair are arranged in parallel on the left and right, while the cleaner body 2, the folded back side with respect to the oscillator 3 on the other side of the swinging member 3 side configured to swing between a folded state which is arranged so as to tune. When the cleaner body 2 is placed on the flat surface of the tank wall, while it is set in parallel state, when the cleaner main body 2 is installed at the corner periphery of the flat surfaces between two adjacent the tank wall in, it is set to folding state.水槽内壁面のコーナー部周辺を清掃できる水槽用クリーナーを提供する。本発明の水槽用クリーナーは、水槽内に配置されるクリーナー本体2と、水槽外に配置され、クリーナー本体2を磁気吸着可能な外側操作部材5と、を備える。クリーナー本体2は、左右一対の揺動体3を備え、一対の揺動体3が左右に並列に配置される並列状態と、一方側の揺動体3が他方側の揺動体3に対し背面側に折曲して配置される折曲状態との間で揺動自在に構成される。水槽内壁面の平坦面にクリーナー本体2が設置される場合には、並列状態に設定される一方、水槽内壁面における隣り合う2つの平坦面間のコーナー部周辺にクリーナー本体2が設置される場合には、折曲状態に設定される。
