as safe care. Furthermore, nurse-physician collaboration has the effect of raising the job satisfaction of nurses and reducing nurses' turnover rate [12,13].Nurses can offer high-quality medical care to the patient w h e n the collaborative relationships of nurses and physicians are good. The perception of collaborative relationships of nurse and physician depends on the characteristic of the unit. Nurses practising in surgical units and in emergency departments had positive perceptions of nurse-physician collaboration [14,15].In this way, while nurse-physician collaboration has been shown to have a large impact on acute medical care, in emergency care in Japan, little research has been performed. Therefore, this research aims to clarify the issue of nurse-physician collaboration in emergency medical care; nurses working in emergency medical centres will be able to clarify when they perceive that a cooperative relationship with the physicians is established.The Japanese emergency care system is characterised by three levels of care. Primary emergency care treats slightly injured patients, who do not need hospitalisation. Secondary emergency care treats