The influence of a fluorescent lighting on embryo growth in a cricket, Gryllodes sigillatus (Orthoptera:Gryllidae) was observed. The experiment was carried out using an incubator of 25°C(±1°C), and using a 10-watt fluorescent lamp. Eggs were placed at 10-, 20-, and 30cm distances from a fluorescent lamp. Eggs were transferred from continuous light(LL)(various periods) to continuous darkness(DD)(or vice versa), it was examined hatching rate and egg period. All eggs died regardless of the distance from the fluorescent lamp under LL. When eggs were transferred to DD following of 72h of LL, 93%-100% of them died. When transferred from LL of 24h or 48 h to DD, mortality tended to decrease as the distance from the fluorescent lamp. When transferred to LL after 120 h of DD, most of the eggs died. However, in the treatment involving 30cm distance from the fluorescent lamp, when transferred to LL after DD of 96h and 120h, eggs were slightly hatched. When eggs were transferred from LL to DD, egg period was not significantly different regardless of time spent in LL, but was about 10days longer than in DD. Similar results were observed in eggs moved from DD to LL conditions.