Berlian Jasa Terminal Indonesia PT (PT. BJTI) Surabaya is one of the companies which handles the activities of load- ing containers. These activities are done in 24 hours every day which bears the dangerous risk that cause unsafe ac- tions and accidents. This study analyzed the differences between the unsafe actions and accidents between each shift over the harbor mobile crane (HMC)’s operation in the PT. BJTI, Surabaya. The design of this study was observational along with the approaches of cross-sectional. This study was conducted among 34 operators of HMC’s. The data used in this study were primary data which were drawn by the results of observation, interview, and secondary data from the company. The results of the study indicated that most of HMC’s operators had been working for more than 3-years long. The highest number of the unsafe actions had occurred when they did not used Personal Protective Equipment (PPE). There were some differences between unsafe actions in each shift with a low category. Most of the medium unsafe actions had occurred during the night shift. There were also some differences between accidents in each shift with an intense category. Mainly, the HMC’s operators experienced an accident by bumped into an objected. The highest frequency of accidents happened during the night shift. The differences between unsafe actions and accidents were induced by the lack of controlled on every shifts and disturbed Circadian Rhythm. The company was expected to be able to adopt a reward and punishment system related to the used of PPE. The company needs to improve the controlled system so that the control could be done on every shift. The company needs to provide first aid officers on every shift.