Sex pheromone lures usually attract the target species very specifically; however, non-target species are often also specifically attracted. Non-target species attracted to a sex pheromone lure could lead to technical problems in pest monitoring. In this study, non-target lepidopteran species specifically attracted to the sex pheromone lures for the cotton bollworm, H<i>elicoverpa armigera</i> (Hübner) and the oriental tobacco budworm, H<i>. assulta</i> (Guenée) were examined in four open fields in Tsu City, Mie, Japan. In addition to specific attraction by the target species, ten (M<i>ythimna turca</i> Linnæus, M<i>. hamifera</i> (Walker), O<i>rbona fragariae pallidior</i> Warren, X<i>ylena fumosa</i> (Butler), X<i>. formosa</i> (Butler), T<i>elorta acuminata</i> (Butler), S<i>ufetula sunidesalis</i> Walker, P<i>arapediasia teterella</i> Zincken, L<i>europerna sera</i> (Meyrick), and E<i>vippe syrictis</i> (Meyrick)) and one (L<i>ymantria dispar</i> (Linnæus)) lepidopteran species were specifically attracted to the lures for H<i>. armigera</i> and H<i>. assulta</i>, respectively. Among these, M<i>. turca</i> and M<i>. hamifera</i> were considered to be the species susceptible to be erroneous determination when H<i>. armigera</i> are counted mechanically or by inexperienced investigators.