The purpose of this study was to develop a perception of importance on patient safety management scale (PI-PSM) for Hospital Employee. The PI-PSM was developed and vallidated as follows: item generation, vertification of content validity, pilot study, and test of validity and reliability. In order to verify preliminary instrument, data was collected from 280 hospital employees. Data were analyzed by Varimax factor analysis and Cronbach"s α. There were 21 items in final instrument categorized into 4 factors as "concern about patient safety management (7 items)", "confidence about patient safety management (5 items)", "will for patient safety management (5 items)", and "recognition about patient safety management (4 items)". The total varience explanined was 60.4%. The internal consistency, Cronbach"s α. was .86, and reliability of the sucscales ranged from .69 to .87. The results of this study may useful to assess the perception of importance on patient safety management.