The present invention relates to 1,3-dioxoindene derivatives, pharmaceutically acceptable salts or optical isomers thereof, a preparation method for same, and a pharmaceutical composition containing same as an active ingredient with antiviral activity. The 1,3-dioxoindene derivatives of formula (1) according to the present invention have low cyto-toxicity, and can also demonstrate utility as pharmaceutical compositions for preventing or treating viral diseases such as:; polio, viral paralysis, acute hemorrhagic conjunctivitis, viral meningitis, hand-foot-mouth disease, blistering diseases, ...