An ultrasound probe includes: a first arm that swings along with rotation of a motor and includes a protrusion； a second arm that rotates along with rotation of a second gear engaged with a first gear attached to a first rotational shaft； a third arm attached to the second arm such that the third arm is rotatable with respect to the second arm； and an ultrasound device connected with the third arm. The protrusion of the first arm is connected with the third arm such that the protrusion is slidable on the third arm along the longitudinal direction of the third arm.
