This paper presents the safety performance of domestic small-sized construction companies including the characteristic and current status of safety management actions of the firms. Safety performance both at the head office and job sites of each construction companies, which are divided two groups by construction capacity ranking, are investigated. The investigation results on the small-sized construction companies in this study was compared with those of on the large and medium-sized construction companies studied in existing papers. General recognition that there is a wide difference of safety performance among domestic construction companies by construction capacity ranking was companies by this study. Especially, Data analysis shows that the safety performance of the small-sized companies has the larger difference than large and midium-sized companies.