PROBLEM TO BE SOLVED: To provide an expanded polystyrene molded product having antibacterial, antifungal and/or alga-proof properties, and a method of producing the same.SOLUTION: An expanded polystyrene molded product comprises, on its surface and/or inside thereof, rubber or ethylene-vinyl acetate copolymer resin comprising one or more selected from antibacterial agent, antifungal agent and alga-proof agent.