An ultrasonic device includes a substrate, a first piezoelectric body, a second piezoelectric body, and an acoustic matching section. The substrate has a first surface that is a flat surface. The first piezoelectric body is disposed on the first surface of the substrate. The second piezoelectric body is disposed on the first surface of the substrate. The second piezoelectric body has a different thickness from a thickness of the first piezoelectric body as measured from the first surface of the substrate. The acoustic matching section is disposed on the first piezoelectric body and the second piezoelectric body. The acoustic matching section has a first side facing the first piezoelectric body and the second piezoelectric body, and a second side opposite from the first side. A surface of the acoustic matching section on the second side is a fiat surface parallel with the first surface of the substrate.一種超音波裝置,其特徵在於包含:基板;第1壓電體,其設置於上述基板之第1面;第2壓電體,其設置於上述基板之上述第1面,且厚度不同於上述第1壓電體;及聲頻匹配部,其設置於上述第1壓電體及上述第2壓電體上;且上述第1面為平坦,於上述聲頻匹配部中,位於上述第1壓電體及上述第2壓電體之相反側之第2面與上述第1面平行且為平坦。1‧‧‧超音波圖像裝置3‧‧‧超音波探針5‧‧‧受檢體5a‧‧‧檢查點8‧‧‧超音波感測器13‧‧‧基板13a‧‧‧第1面14‧‧‧第1壓電體14a‧‧‧第1電極14b‧‧‧第2電極14c‧‧‧第1壓電體厚度15‧‧‧第2壓電體15a‧‧‧第1電極15b‧‧‧第2電極15c‧‧‧第2壓電體厚度16‧‧‧聲頻匹配部16a‧‧‧第2面16b‧‧‧第1聲頻匹配部16c‧‧‧第2聲頻匹配部16d‧‧‧第1聲頻匹配部厚度16e‧‧‧第2聲頻匹配部厚度18‧‧‧聲頻透鏡21‧‧‧超音波21a‧‧‧反射波
