Which country's brand is Omron atomizer?

Japan. According to Omron official website, Omron 1933 started as a well-known brand of home health monitoring equipment. Committed to providing effective help for the prevention and treatment of diseases from the perspective of family health monitoring, including electronic sphygmomanometer, electronic blood glucose meter, electronic thermometer, atomizer, oxygen generator, calorie meter, pedometer, fat scale, weighing scale, low-frequency therapeutic instrument, etc.