Membrane filtration device

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(57) Abstract : Disclosed is a membrane filtration device capable of more suitably disposing a radio antenna so as to successfully perform radio communication. An internal member (100), at least part of the outer wall of which is close to the inner wall of a pressure-resistant container (40) is provided to a position different from that between a filtration membrane within the pressure-re- sistant container (40) and the inner wall of the pressure-resistant container (40), and a radio antenna (103A) is provided to the in- ternal member (100). The at least part of the outer wall of the internal member (100) is close to the inner wall of the pressure-re- slstant container (40), so that the thickness of a stock solution present between the outer wall and the inner wall of the pressure-re- sistant container (40) is small, and attenuation of radio waves due to the stock solution can be minimized, thereby making it possi- ble to successfully perform the radio communication. Furthermore, restrictions on the position at which the radio antenna (103A) is disposed can be relaxed to more suitably dispose the radio antenna (103A) as compared with the case in which the radio anten- na (103A) is provided between the filtration membrane within the pressure-resistant container (40) and the inner wall of the pres- sure-resistant container (40).