This invention provides albumin preparations with safety and without any risk of side effects, which are free from viruses or contaminating proteins and can be stably stored over a long time while showing neither changes in appearance nor decrease in content.There are provided a stabilized albumin preparation produced by uniformly mixing a medium-chain fatty acid or a salt thereof and a sulfur-containing amino acid or a derivative thereof with an aqueous albumin solution (e.g., a buffer such as phosphate buffer which can be administered as pharmaceutical preparations, injection water, or a physiological saline) and dissolving them therein, and then processing the mixture solution into a formulation suitable for parenteral administration such as an intravenous fluid preparation or an injectable solution, and a stabilization method for an albumin preparation.