Cartridge for adjusting the depth of focus of the focused ultrasound according to the invention, a guide member disposed in an arbitrary direction; An ultrasonic unit that outputs a medical focused ultrasound; Once the addition is ultrasonic coupled to the movable elongated member along the guide member; And a first receiving unit which incorporates the guide member and the extension member, including and, by inserting the predetermined tool from the exterior of the cartridge further comprising an arriving path that can be reached in the ultrasound unit, the arriving path the can by using the tool, the insertion control the depth of engagement of the ultrasonic portion of the extension member through.;
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