This experiment was conducted to determine the effect of royal jelly on growth in mouse. Five or 10 ㎎ of royal jelly was injected to 8 male or female mice every two other day for 18 days. Body weigt gain, feed consumption and feed efficiency were measured in the mice for 4 weeks. Body weight gain of royal jelly treated lots was 10-20 percent more than than that of control lot, but it was not significant statistically. The difference in feed consumption way found insignificant between treatments, although male mice fed slightly more feed than female mice. No appreciable difference was found in feed efficiency between treatments.