A mobile ultrasonic diagnostic device comprising: a battery (30) a storage processing unit (38) that performs storage processing of data used by the mobile ultrasonic diagnostic device a high-speed storage unit (80) that performs storage processing faster than the storage processing unit (38) and a storage processing determination unit (36) that determines the storage processing on the basis of the temperature or remaining power of the battery (30). Data can be safely used without loss even when there is the possibility that power cannot be supplied from the battery, as a result of the storage processing unit (38) and the high-speed storage unit (80) performing storage processing on the basis of the storage processing determined by the storage processing determination unit (36).
