A glass unit according to the present invention includes a first glass plate having a through hole formed therein, a second glass plate that is arranged facing the first glass plate at a predetermined interval therefrom and forms an internal space with the first glass plate, a sealing member that seals a gap at peripheral edges of the first glass plate and the second glass plate, a cover that closes the through hole, and an adhesive that fixes the cover to the first glass plate. The internal space has been depressurized to a vacuum state, or a predetermined gas has been injected into the internal space, and the first glass plate and the cover are fixed by the adhesive.