An ultrasonic diagnosing device is provided for diagnosing a state of a to-be-examined part based on echo signals caused by ultrasonic signals. The device includes a container body containing liquid and capable of coming in close contact with a to-be-examined body, an ultrasonic wave penetrating part having ultrasonic penetrability and covering an opening formed in the container body, a probe having an ultrasonic wave transmitting part configured to transmit the ultrasonic signals, and a drive mechanism configured to move the probe inside the container body and change a position of the ultrasonic wave transmitting part. The probe being soaked in the liquid inside the container body in a state where the ultrasonic wave transmitting part is separated from the ultrasonic wave penetrating part, and the ultrasonic signals being transmitted to the to-be-examined body through the liquid and the ultrasonic wave penetrating part by the ultrasonic wave transmitting part.