A portable ultrasound image diagnostic apparatus is shown. The apparatus includes an ultrasound probe and a hinge. The ultrasound probe transmits and receives ultrasound. The hinge connects a first housing and a lower edge portion of a second housing including a display panel so that the second housing is overlapped on the first housing to fold the portable ultrasound image diagnostic apparatus. The hinge is provided on an upper face of the first housing in a near side than a center. The second housing is rotated to a far side of the first housing with a horizontal axis of the hinge as a supporting axis to fold the portable ultrasound image diagnostic apparatus.