A portable ultrasonic diagnostic device (10) is provided with: a device main body (12) and a probe-accommodating case (14) for accommodating an ultrasonic probe. The probe-accommodating case (14) is capable of being attached to and detached from the device main body (12), and can be set in a stacked state in which the device main body (12) is placed thereon. The ultrasonic diagnostic device (10) is capable of being used while in the stacked state and while the device main body (12) is in a stand-alone state.