To provide a discharge device in which it is made difficult for a discharge inhibitory substance to adhere to an aqueous solution-immersed discharge portion of a discharge electrode.SOLUTION: The discharge device includes a tray (41), a discharge electrode (61) for discharging in aqueous solution in the tray (41), and a semi-permeable membrane member (52), which is a partial region in the tray (41) and defines a region including the discharge electrode (61), with at least a part comprising semi-permeable membrane.SELECTED DRAWING: Figure 2【課題】放電電極の、水溶液に浸した放電部分に放電阻害物質を付着し難くする。【解決手段】放電装置は、トレイ（４１）と、トレイ（４１）内の水溶液中にて放電を行う放電電極（６１）と、トレイ（４１）内の一部の領域であって放電電極（６１）を含む領域を区画し、少なくとも一部が半透膜からなる半透膜部材（５２）とを備える。【選択図】図２
