A battery trial with 280 broiler chicks of Hi-sex strain was conducted for 8 weeks to examine the growth promoting effect of commercial anticoccidials for broiler chicks. A total of 6 treatments which consisted of 1) control 2) anticoccidials A 3) anticoccidials B 4) anticoccidials C 5) anticoccidials A (0-4 weeks)-C (5-8 weeks) 6) anticoccidials B (0-4 weeks)-C (5-8 weeks) were employed with 4 replicates of 10 birds each. The criteria used in this study were growth rate, feed intake, feed conversion rate, mortality and nutrient utilizability. The results obtained are summarized as follows: 1. It was found that all of the birds fed anticoccidials gained the body weight more rapidly than those fed non-anticoccidials during the whole period (p$lt;0.05). The growth promoting effect of 3 anticoccidials examined were in order of A, B and C. But it should be mentioned that growth promoting effect of anticoccidials C was more remarkable during the finishing period than starting period. The total body gain of A-C and BC were 1955.68 and 1902.68, respectively, which were similar to those of anticoccidial C (1943.1g). Also the feed intake of the anticoccidials treated groups was increased in proportion to its body gain. However, there were no statistical differences in feed conversion rate among the treatments. 2. Anticoccidials did not exert any effect on the utilizabilities of nutrient examined. 3. There were no statistical differences in mortality among the treatments and the mortality due to coccidiosis did not occur in all treatments. Based upon these results it may be concluded that growth promoting effect of anticoccidials was remarkable as compared to control, and that the extent of growth promoting effect of each anticoccidials was various.