PROBLEM TO BE SOLVED: To provide a channel switching device which can be suitably used for an ornamental aquarium.SOLUTION: A channel switching device of the invention comprises: an outer pipe 41 on which first and second outlets 43, 44 are formed and an inner pipe 51 which is movably stored in the outer pipe 41 and on which openings 53, 54 are formed. The outer pipe 41 has an inflow port 42 communicated to inside of the inner pipe 51. The inner pipe 51 is movably operated to the outer pipe 41, the opening 53 is made correspond to the first outlet 43, then the second outlet 44 is closed by a peripheral wall of the inner pipe 41, thereby becoming a first channel state in which water W flowed from the inflow port 42 exits from the first outlet 43. The opening 54 is made correspond to the second outlet 44, and the first outlet 43 is closed by the peripheral wall of the inner pipe 41, thereby becoming a second channel state in which the water W flowed from the inflow port 42 exits from the second outlet 44. The first state and second state can be switched.SELECTED DRAWING: Figure 5
