To produce a formed article having excellent characteristics and physical properties such as ultraviolet-shielding function, moistureproofing function and gas-barrier function as well as antistatic function by using an antistatic agent safely applicable without restriction on the application field and producible without using complicate procedures.

The objective antistatic agent is composed mainly of an acid- treated yeast cell wall fraction consisting of a residue produced by removing soluble intracellular component from enzyme-treated yeast, treating the obtained cell residue with an acidic aqueous solution and further removing soluble matters. The obtained antistatic agent is used in the production of a formed article having the form of sheet, film, granule, capsule, etc., and having excellent antistaticity represented by a surface resistivity of 106-109 Ω measured at 23°C and RH50%. The antistatic agent may contain a plasticizer such as glycerol.