Sensitivity to several rice paddy pesticide formulations（4 nursery-box-applied insecticides and 7 herbicides）for the tadpoles of Japanese Tree Frog（Hyla japonica） was tested. LC₅₀ values of 4 insecticides and 4 paddy herbicides for the tadpoles were high（> 100mg/L）, however, those of 3 herbicides（Kirifuda one kilo granule, Boss one kilo granule and Sparkstar one kilo granule）were relatively low（10-30mg/L）. In the active ingredients of the 3 herbicides, which showed high toxicity, LC₅₀ values of indanofan, esprocarb, pretilachlor and dimethametryn were low（0.3-5mg/L）. Concentration changes of these active ingredients in paddy water was calculated by the simulation model（PADDY）, and the calculated maximum concentrations of indanofan, esprocarb, pretilachlor and dimethametryn were less than LC₅₀ values of these active ingredients for the tadpoles. These results suggest that the tested rice paddy pesticides are less likely to influence to the Japanese Tree Frog’s tadpoles.

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