the present invention relates to an ink supplying apparatus capable of achieving labor - saving of the cleaning operation and shortening of the working time at ink replacement or the like in a printing press . this ink supplying apparatus is equipped with an ink tray provided in the interior of an ink fountain and having a bottom plate which covers upper surfaces of ink keys , and further equipped with a deflection restraining structure for supporting the bottom plate from below to restrain the deflection of the ink tray .