An ultrasound diagnostic apparatus comprising: an ultrasound probe; an image acquisition unit that acquires an ultrasound image of a subject by performing transmission and reception of an ultrasound beam to and from the ultrasound probe; a display unit that displays the ultrasound image acquired by the image acquisition unit; a bladder pattern storage unit that stores a normal bladder pattern and an abnormal bladder pattern; a reference pattern setting unit that sets one of the normal bladder pattern and the abnormal bladder pattern stored in the bladder pattern storage unit, as a reference pattern; a bladder extraction unit that extracts a bladder region from the ultrasound image acquired by the image acquisition unit; a bladder extraction success/failure determination unit that determines whether or not the bladder region extracted by the bladder extraction unit represents a bladder having the reference pattern set by the reference pattern setting unit; and an image quality adjustment unit that adjusts an image quality of the ultrasound image, and an apparatus controller configured to perform as follows: in a case where the reference pattern setting unit sets the normal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines that the bladder region does not represent a bladder having the reference pattern, the image quality adjustment unit adjusts the image quality of the ultrasound image and the bladder extraction success/failure determination unit determines whether or not the bladder region represents the bladder having the reference pattern for the ultrasound image of which the image quality is adjusted, and in a case where the bladder extraction success/failure determination unit determines that the bladder region does not represent the bladder having the reference pattern even in the ultrasound image of which the image quality is adjusted by the image quality adjustment unit, the reference pattern setting unit sets the abnormal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines whether or not the bladder region represents a bladder having the reference pattern consisting of the abnormal bladder pattern. an ultrasound probe; an image acquisition unit that acquires an ultrasound image of a subject by performing transmission and reception of an ultrasound beam to and from the ultrasound probe; a display unit that displays the ultrasound image acquired by the image acquisition unit; a bladder pattern storage unit that stores a normal bladder pattern and an abnormal bladder pattern; a reference pattern setting unit that sets one of the normal bladder pattern and the abnormal bladder pattern stored in the bladder pattern storage unit, as a reference pattern; a bladder extraction unit that extracts a bladder region from the ultrasound image acquired by the image acquisition unit; a bladder extraction success/failure determination unit that determines whether or not the bladder region extracted by the bladder extraction unit represents a bladder having the reference pattern set by the reference pattern setting unit; and an image quality adjustment unit that adjusts an image quality of the ultrasound image, and an apparatus controller configured to perform as follows: in a case where the reference pattern setting unit sets the normal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines that the bladder region does not represent a bladder having the reference pattern, the image quality adjustment unit adjusts the image quality of the ultrasound image and the bladder extraction success/failure determination unit determines whether or not the bladder region represents the bladder having the reference pattern for the ultrasound image of which the image quality is adjusted, and in a case where the bladder extraction success/failure determination unit determines that the bladder region does not represent the bladder having the reference pattern even in the ultrasound image of which the image quality is adjusted by the image quality adjustment unit, the reference pattern setting unit sets the abnormal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines whether or not the bladder region represents a bladder having the reference pattern consisting of the abnormal bladder pattern. in a case where the reference pattern setting unit sets the normal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines that the bladder region does not represent a bladder having the reference pattern, the image quality adjustment unit adjusts the image quality of the ultrasound image and the bladder extraction success/failure determination unit determines whether or not the bladder region represents the bladder having the reference pattern for the ultrasound image of which the image quality is adjusted, and in a case where the bladder extraction success/failure determination unit determines that the bladder region does not represent the bladder having the reference pattern even in the ultrasound image of which the image quality is adjusted by the image quality adjustment unit, the reference pattern setting unit sets the abnormal bladder pattern as the reference pattern and the bladder extraction success/failure determination unit determines whether or not the bladder region represents a bladder having the reference pattern consisting of the abnormal bladder pattern.