PROBLEM TO BE SOLVED: To provide a medical image device capable of easily setting a region of interest as large as possible in a region where the brightness of an image is uniform. An ultrasonic diagnostic apparatus has a dividing function for setting a plurality of divided regions DR1 for a B-mode image of a subject, and a predetermined uniformity of image brightness in the divided regions DR1 adjacent to each other. A determination function that determines whether or not the criterion is satisfied, and an integration function that integrates the divided regions DR when the determination function determines that the brightness uniformity of the image satisfies a predetermined criterion, and an integration function that integrates the divided regions DR. A region of interest setting function for setting the region of interest R in the obtained region DR3, and a control circuit that executes the function. [Selection diagram] Figure 8【課題】画像の輝度が一様な領域にできるだけ大きな関心領域を容易に設定することができる医用画像装置を提供する。【解決手段】超音波診断装置は、被検体のＢモード画像に対して、複数の分割領域ＤＲ１を設定する分割機能と、互いに隣り合う分割領域ＤＲ１について、画像の輝度の一様性が所定の基準を満たすか否かを判定する判定機能と、判定機能により、画像の輝度の一様性が所定の基準を満たすと判定された場合、分割領域ＤＲを統合する統合機能と、統合機能によって統合されて得られた領域ＤＲ３に関心領域Ｒを設定する関心領域設定機能と、を実行する制御回路を備える。【選択図】図８
