An ultrasound imaging device (3, 3'), comprising: an image generation module configured to receive ultrasound waves transmitted from a surface of an analyte towards an inside of the analyte and reflected therein, and generate an ultrasound image of the inside of the analyte; a reference point setting module (353, 353') configured to set a reference point of a tissue of interest of the ultrasound image; a first seed point imparting module (354, 354') configured to impart one or more seed points to the ultrasound image with reference to the reference point, wherein: the first seed point imparting module (354, 354') imparts the seed point at a predetermined position relative to the reference point; and a region demarcation module configured to demarcate a region to which the seed point belongs, and divide an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue, the ultrasound imaging device (3, 3') characterised by further comprising: a rotation angle adjusting module configured to adjust a rotation angle of the ultrasound image and direct a portion of the analyte included in the ultrasound image in a predetermined direction, wherein: the rotation angle adjusting module directs a navel portion of the analyte included in the ultrasound image in the predetermined direction by adjusting a direction of the ultrasound image; and the reference point is included in a white line existing between a pair of right and left rectus abdominis muscles of the abdomen; and wherein: the reference point setting module (353, 353') sets the reference point in the rotation angle adjusted ultrasound image. an image generation module configured to receive ultrasound waves transmitted from a surface of an analyte towards an inside of the analyte and reflected therein, and generate an ultrasound image of the inside of the analyte; a reference point setting module (353, 353') configured to set a reference point of a tissue of interest of the ultrasound image; a first seed point imparting module (354, 354') configured to impart one or more seed points to the ultrasound image with reference to the reference point, wherein: the first seed point imparting module (354, 354') imparts the seed point at a predetermined position relative to the reference point; and a region demarcation module configured to demarcate a region to which the seed point belongs, and divide an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue, the ultrasound imaging device (3, 3') characterised by further comprising: a rotation angle adjusting module configured to adjust a rotation angle of the ultrasound image and direct a portion of the analyte included in the ultrasound image in a predetermined direction, wherein: the rotation angle adjusting module directs a navel portion of the analyte included in the ultrasound image in the predetermined direction by adjusting a direction of the ultrasound image; and the reference point is included in a white line existing between a pair of right and left rectus abdominis muscles of the abdomen; and wherein: the reference point setting module (353, 353') sets the reference point in the rotation angle adjusted ultrasound image. the first seed point imparting module (354, 354') imparts the seed point at a predetermined position relative to the reference point; and a region demarcation module configured to demarcate a region to which the seed point belongs, and divide an image region of the analyte included in the ultrasound image into a plurality of regions according to a type of tissue, the ultrasound imaging device (3, 3') characterised by further comprising: a rotation angle adjusting module configured to adjust a rotation angle of the ultrasound image and direct a portion of the analyte included in the ultrasound image in a predetermined direction, wherein: the rotation angle adjusting module directs a navel portion of the analyte included in the ultrasound image in the predetermined direction by adjusting a direction of the ultrasound image; and the reference point is included in a white line existing between a pair of right and left rectus abdominis muscles of the abdomen; and wherein: the reference point setting module (353, 353') sets the reference point in the rotation angle adjusted ultrasound image. the rotation angle adjusting module directs a navel portion of the analyte included in the ultrasound image in the predetermined direction by adjusting a direction of the ultrasound image; and the reference point is included in a white line existing between a pair of right and left rectus abdominis muscles of the abdomen; and wherein: the reference point setting module (353, 353') sets the reference point in the rotation angle adjusted ultrasound image.