The present invention provides a production process for a terminal-end-stabilized glyoxylic acid -based polymer, which process enables to reduce the amount of the polymerization solvent, as recovered or removed after the end of the polymerization or after the end of the hydrolysis, without lowering the production efficiency. By adjusting the position of the spreader plate relative to the hopper, the flow of breading material from the downspout may be distributed as desired between the hopper sections. The release lever is a part of a door lock positioned within the door. A total content of 60 to 130 parts by weight of two types of silica, that is silica X and silica Y.