PROBLEM TO BE SOLVED: To provide an ultrasonic probe capable of scanning an ultrasonic wave in a wide state or a narrow state. An ultrasonic probe (1) includes a first portion (2A) and second portions (3A, 3B), and a first portion (2) is formed so that a first state and a second state are formed. 2A and at least one of the second portions 3A and 3B are configured to be rotatable with respect to the other, and the first state is at least one end of both ends of the first portion 2A in the ultrasonic scanning direction. The second portion is a state in which the second portions 3A and 3B exist, and the second state is that at least one of the both ends of the first portion 2A in the ultrasonic scanning direction has the second portion. 3A and 3B are not present. [Selection diagram] Figure 2
