The invention provides an effective component which has a higher insecticidal effect for mosquito, let alone fly, when compared with the prior d-allethrin pastille, as well as a fly repellent pastille. The invention relates to a fly repellent pastille which comprises 0.05 to 0.5 quality percents of 2,2,3,3-tetramethyl cyclopropane formic acid 4-methoxyl group methyl-2,3,5,6-tetrafluoro benzyl ester shown in the following chemical formula as the effective component, as well as N-(2-ethylhexyl)-bicyclo-[2,2,1]-G-5-alkene-2,3-dicarboximide which is more than 0.1 times of the effective component as a synergistic agent.
