PURPOSE: A moisture inflow alarm device of a medical device is provided, which can secure safety and durability of the medical device by easily recognizing the state of the medical device. CONSTITUTION: A moisture inflow alarm device of a medical device comprises a first housing(20), a second housing(30), and a check valve(60). The first housing has a pipe shape that both ends are opened. A part of the first housing is inserted in medical device main bodies(1,3). The second housing is combined with one inner side of the first housing and has the internal space. A part of the second housing is exposed to the outside of the medical device main body and the exposed part is provided with a transparent window(32). The check valve is arranged to be contact with an end part of the second housing in the first housing.
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