An ultrasonic probe for supporting spine surgery serving as a tissue insertion type ultrasonic probe comprises an insertion unit and an operation unit. On a front end portion of the insertion unit, a tactile member and a transducer unit are provided. The insertion unit comprises a pipe, and a sheath tube provided outside of the pipe. An FPC board serving as a line sheet is provided in the pipe. The FPC board is inserted in a rounded shape similar to a tube along an inner wall surface of the pipe. A large number of signal lines are formed on the FPC board through printing. A ground cable is provided in an inside space of the FPC board. In the operation unit, a rear end portion of the FPC board and a front end portion of another FPC board are connected by thermo compression bonding.
