A surgical operating apparatus comprising: a sheath provided with a distal end part and a proximal end part; an apparatus main body to be coupled to the proximal end part of the sheath; a probe which is provided with a distal end part and a proximal end part, is inserted into the sheath, and transmits ultrasonic vibration from the proximal end part side to the distal end part side; a jaw which is turnably supported at the distal end part of the sheath, and can be operated to be opened or closed between a closed position at which the jaw is engaged with the distal end part of the probe, and an opened position at which the jaw is separated from the distal end part of the probe; a handle which is provided on the apparatus main body, and is adapted to operate the opening/closing operation of the jaw according to an operation force of the handle; a slider section which is provided in the apparatus main body, and can be advanced/retreated to be moved in a central axis direction of the probe between a first movement position corresponding to the opened position of the jaw and a second movement position corresponding to the closed position of the jaw in accordance with the operation of the handle; a slider receiving member which is provided in the apparatus main body, and is adapted to guide the movement of the slider section; a spring receiver arranged on an outer circumferential surface of the slider receiving member; a coil spring being arranged between the slider section and the spring receiver; and a stopper configured to be brought into contact with the slider receiving member; wherein, when the slider section is moved from the first movement position to the second position in accordance with the operation of the handle, the slider receiving member is also advanced together with the slider section; when the operation force of the handle is larger than a predetermined amount, the slider receiving member is brought into contact with the stopper, and, thereafter, only the slider section moves in a distal direction against a spring force of the coil spring according to operation of the handle, and thereafter, when a length of the coil spring is changed to a length corresponding to a movement of the slider section of a set amount, wherein the set amount corresponds to a predetermined grasping force for grasping living tissue by the jaw, a notification mechanism (801, 811) notifies of a state where the slider section has moved by an amount equal to or larger than the set amount on the way thereof from the first movement position to the second movement position. a sheath provided with a distal end part and a proximal end part; an apparatus main body to be coupled to the proximal end part of the sheath; a probe which is provided with a distal end part and a proximal end part, is inserted into the sheath, and transmits ultrasonic vibration from the proximal end part side to the distal end part side; a jaw which is turnably supported at the distal end part of the sheath, and can be operated to be opened or closed between a closed position at which the jaw is engaged with the distal end part of the probe, and an opened position at which the jaw is separated from the distal end part of the probe; a handle which is provided on the apparatus main body, and is adapted to operate the opening/closing operation of the jaw according to an operation force of the handle; a slider section which is provided in the apparatus main body, and can be advanced/retreated to be moved in a central axis direction of the probe between a first movement position corresponding to the opened position of the jaw and a second movement position corresponding to the closed position of the jaw in accordance with the operation of the handle; a slider receiving member which is provided in the apparatus main body, and is adapted to guide the movement of the slider section; a spring receiver arranged on an outer circumferential surface of the slider receiving member; a coil spring being arranged between the slider section and the spring receiver; and a stopper configured to be brought into contact with the slider receiving member; wherein, when the slider section is moved from the first movement position to the second position in accordance with the operation of the handle, the slider receiving member is also advanced together with the slider section; when the operation force of the handle is larger than a predetermined amount, the slider receiving member is brought into contact with the stopper, and, thereafter, only the slider section moves in a distal direction against a spring force of the coil spring according to operation of the handle, and thereafter, when a length of the coil spring is changed to a length corresponding to a movement of the slider section of a set amount, wherein the set amount corresponds to a predetermined grasping force for grasping living tissue by the jaw, a notification mechanism (801, 811) notifies of a state where the slider section has moved by an amount equal to or larger than the set amount on the way thereof from the first movement position to the second movement position.