The present invention relates to a detachably joined ultrasonic probe device, including modular ultrasonic probe and a case for detachably joining with the modular ultrasonic probes, which enables the user to select a suitable ultrasonic probe according to desired performance and diagnosis frequency region. The device according to the present invention includes: a plurality of ultrasonic probe modules horizontally arranged in the direction of generating an ultrasonic wave； a case consisting of an outer housing with one open side for receiving and enclosing the plurality of ultrasonic probe modules, and a separation housing provided between the plurality of ultrasonic probe modules for separating the ultrasonic modules from one another, so as to detachably join with the ultrasonic modules； and a control module installed in the case for controlling the plurality of ultrasonic probe modules.
