An ultrasound probe includes: a transducer unit having a plurality of ultrasound transducers； a flexible substrate configured to be flat L-shaped in a relaxed state； and a plurality of coaxial wires configured to electrically connect the transducer unit to the flexible substrate. The flexible substrate has thereon: a plurality of signal lines configured to be electrically connected to the transducer unit via the plurality of coaxial wires； and a first return GND that is a ground for the plurality of signal lines and is formed on an inner side of the L-shaped flexible substrate with respect to the plurality of signal lines.
