Provided is an electron beam irradiating device capable of emitting an electron beam (B) from an electron beam generation source surrounded by a vacuum chamber to outside of the vacuum chamber through an electron beam exit window (4). The electron beam exit window (4) includes: a grid (6)； a window foil (9) allowing the electron beam to pass therethrough； and a frame-shaped pressing member (10) pressing the window foil (9) against the grid (6). The surface of the grid (6) has a groove section (81) having an annular shape. A metal gasket (11) is pressed between the groove section (81) and the window foil (9).
