The purpose of this study was to determination of body weight and some carcass traits in Japanese quails (Coturnix coturnix japonica) of different lines. The material used in this experiment was selected from three lines: high body weight line (HL), low body weight line (LL) of 5-week body weight and a random bred control line (C). There were significant differences among the lines in respect to body weight and carcass weight. Highest and lowest body weight and carcass weight were measured in HL and LL lines, respectively. While there were no significant differences among the lines in terms of relative proportion of breast, the sex affected significantly (P<0.01). No significant differences were found in terms of left wing, right wing, neck and back percent of body weight for lines and sexes. Also, there were found significant correlations among the carcass traits.