An ultrasound probe comprises: a transducer array having an ultrasound transmission/reception surface a housing for containing a transducer array, a transmission/reception board, a wireless communication board and a battery and a puncture guide fixed to the housing and having a puncture needle insertion port located on a line extending in a direction of arrangement of the transducer array, wherein when the ultrasound transmission/reception surface of the transducer array is in a horizontal posture, the probe has a center of gravity lying between a center of arrangement of the transducer array and the puncture needle insertion port of the puncture guide in the direction of arrangement of the transducer array and, at the same time, being almost in accordance with a centerline of arrangement of the transducer array in a direction orthogonal to the direction of arrangement of the transducer array.
