An ultrasonic transducer element chip includes a substrate, a plurality of ultrasonic transducer elements and a plate-shaped member. The substrate includes a partition wall section defining a plurality of openings arranged in an array pattern. A wall thickness of the partition wall section is smaller than a wall height of partition wall section. Each of the ultrasonic transducer elements is provided in each of the openings. The plate-shaped member is fixed on a surface of the substrate opposite to a surface of the substrate on which the ultrasonic transducer elements are provided. The plate-shaped member covers at least one of the openings in a plan view seen along a thickness direction of the substrate.一種超音波轉換器元件晶片,其特徵在於包含:基板,其呈陣列狀配置有複數個開口;超音波轉換器元件,其設置於上述複數個開口之各者;及板狀構件,其固定於上述基板之與設置有上述超音波轉換器元件之面為相反側之面,且於自上述基板之厚度方向之俯視下覆蓋上述複數個開口中之至少1個以上;且於上述複數個開口之間之間隔壁部中,壁厚度小於壁高度。11‧‧‧電子機器(超音波診斷裝置)12‧‧‧裝置終端13‧‧‧探針(超音波探針)14‧‧‧電纜15‧‧‧顯示裝置(顯示面板)
