A focused ultrasound operation apparatus comprising: an operation handpiece that is used as an operator's handle; a cartridge that is insertable into vagina of an operation target, is disposed to be attachable to and detachable from the operation handpiece, and has an ultrasound treatment part configured to generate focused ultrasound disposed therein; a driving device configured to drive the ultrasound treatment part so that the ultrasound treatment part moves back and forth along a longitudinal direction of the cartridge; a sensing device configured to determine whether the cartridge is normally placed inside the vagina; the sensing device includes: a first sensor arranged at one side of the cartridge to sense contact with a first position in the vagina; and a second sensor arranged at the other side of the cartridge to sense contact with a second position in the vagina, which is different from the first position, and a determination part configured to review sensed data sent from the sensing device and determine whether the cartridge is normally placed inside the vagina, wherein the determination part determines that the cartridge is normally placed when both the first sensor and the second sensor are sensed as being in contact with a skin surface inside the vagina and determines that the cartridge is abnormally placed when any of the first sensor and the second sensor is not sensed as being in contact with the skin surface inside the vagina, and characterized in that: the sensing device includes third sensors arranged to be spaced apart from each other along the longitudinal direction of the cartridge; and the determination part receives sensed data from the third sensors and calculates a depth by which the cartridge is inserted into the vagina during operation. an operation handpiece that is used as an operator's handle; a cartridge that is insertable into vagina of an operation target, is disposed to be attachable to and detachable from the operation handpiece, and has an ultrasound treatment part configured to generate focused ultrasound disposed therein; a driving device configured to drive the ultrasound treatment part so that the ultrasound treatment part moves back and forth along a longitudinal direction of the cartridge; a sensing device configured to determine whether the cartridge is normally placed inside the vagina; the sensing device includes: a first sensor arranged at one side of the cartridge to sense contact with a first position in the vagina; and a second sensor arranged at the other side of the cartridge to sense contact with a second position in the vagina, which is different from the first position, and a determination part configured to review sensed data sent from the sensing device and determine whether the cartridge is normally placed inside the vagina, wherein the determination part determines that the cartridge is normally placed when both the first sensor and the second sensor are sensed as being in contact with a skin surface inside the vagina and determines that the cartridge is abnormally placed when any of the first sensor and the second sensor is not sensed as being in contact with the skin surface inside the vagina, and characterized in that: the sensing device includes third sensors arranged to be spaced apart from each other along the longitudinal direction of the cartridge; and the determination part receives sensed data from the third sensors and calculates a depth by which the cartridge is inserted into the vagina during operation. a first sensor arranged at one side of the cartridge to sense contact with a first position in the vagina; and a second sensor arranged at the other side of the cartridge to sense contact with a second position in the vagina, which is different from the first position, and a determination part configured to review sensed data sent from the sensing device and determine whether the cartridge is normally placed inside the vagina, wherein the determination part determines that the cartridge is normally placed when both the first sensor and the second sensor are sensed as being in contact with a skin surface inside the vagina and determines that the cartridge is abnormally placed when any of the first sensor and the second sensor is not sensed as being in contact with the skin surface inside the vagina, and characterized in that: the sensing device includes third sensors arranged to be spaced apart from each other along the longitudinal direction of the cartridge; and the determination part receives sensed data from the third sensors and calculates a depth by which the cartridge is inserted into the vagina during operation. the sensing device includes third sensors arranged to be spaced apart from each other along the longitudinal direction of the cartridge; and the determination part receives sensed data from the third sensors and calculates a depth by which the cartridge is inserted into the vagina during operation.