An ultrasonic endoscope comprising: an ultrasonic transducer comprising an ultrasonic vibrator; a distal end portion body configured to be disposed continuously with a proximal end side of the ultrasonic transducer; an erecting base housing portion configured to be disposed in the distal end portion body and configured to have an opening whose opening direction is one side in a first direction that is perpendicular to an axial direction of the distal end portion body or whose opening direction is a direction that has a component toward one side in the first direction and a component toward a distal end side in the axial direction of the distal end portion body; a treatment tool lead-out port configured to communicate with an inside of the erecting base housing portion and from which a treatment tool is led out; an erecting base configured to be disposed in the inside of the erecting base housing portion and that changes a lead out direction of the treatment tool led out from the treatment tool lead-out port; and a cleaning communication hole configured to be formed in a wall surface on a side opposite to a side where the opening of the erecting base housing portion is disposed and that communicates with an outside, characterized in that the ultrasonic endoscope comprises a signal cable that is connected to the ultrasonic vibrator, wherein, when the signal cable and the erecting base housing portion are projected onto a plane that is perpendicular to the first direction. the signal cable is disposed in a region that is different from a region where the erecting base housing portion is disposed. an ultrasonic transducer comprising an ultrasonic vibrator; a distal end portion body configured to be disposed continuously with a proximal end side of the ultrasonic transducer; an erecting base housing portion configured to be disposed in the distal end portion body and configured to have an opening whose opening direction is one side in a first direction that is perpendicular to an axial direction of the distal end portion body or whose opening direction is a direction that has a component toward one side in the first direction and a component toward a distal end side in the axial direction of the distal end portion body; a treatment tool lead-out port configured to communicate with an inside of the erecting base housing portion and from which a treatment tool is led out; an erecting base configured to be disposed in the inside of the erecting base housing portion and that changes a lead out direction of the treatment tool led out from the treatment tool lead-out port; and a cleaning communication hole configured to be formed in a wall surface on a side opposite to a side where the opening of the erecting base housing portion is disposed and that communicates with an outside, characterized in that the ultrasonic endoscope comprises a signal cable that is connected to the ultrasonic vibrator, wherein, when the signal cable and the erecting base housing portion are projected onto a plane that is perpendicular to the first direction. the signal cable is disposed in a region that is different from a region where the erecting base housing portion is disposed.