To provide an ultrasonic urine volume measuring instrument that can highly accurately measure urine volume of a measurement subject and that is convenient for the measurement subject. There are provided a mode selector (22a) capable of selecting one of a measurement mode of measuring urine volume while an ultrasound probe (10) is placed at a certain measurement position on the stomach of a measurement subject, and a positioning mode of measuring urine volume while moving the ultrasound probe (10) to a plurality of tentative measurement positions on the stomach in order to determine the measurement position suitable for placing the ultrasound probe (10) in the measurement mode and an index value memory that stores a maximum value among urine volumes at the plurality of tentative measurement positions, calculated by the arithmetic unit (24), while the positioning mode is being selected, and/or an allowance value determined on the basis of the maximum value. The maximum value and/or the allowance value is displayed, on a graph on a display unit (27), as a positioning index value for positioning the ultrasound probe (10).提供可高精度地測定被測定者的尿量,對於被測定者來說高便利性的超音波尿量測定器。具有可選擇在將超音波探頭(10)安裝於前述被測定者的腹部之所定測定位置之狀態下測定尿量的測定模式,及為了決定該測定模式中適合安裝超音波探頭(10)的前述測定位置,於腹部的複數暫定測定位置一邊使超音波探頭(10)移動一邊測定尿量的定位模式之任一的模式選擇部(22a),與記憶在選擇定位模式之間,藉由運算部(24)所計算出之複數暫定測定位置之尿量中的最大值及/或依據最大值所訂定之允許值的指標值記憶部;最大值及/或允許值,作為用以將超音波探頭(10)定位的定位指標值,顯示於顯示部(27)的圖表上。1‧‧‧超音波尿量測定器10‧‧‧超音波探頭20‧‧‧控制部21‧‧‧超音波控制部22‧‧‧輸入部22a‧‧‧模式選擇部23‧‧‧記憶部23a‧‧‧指標值記憶部24‧‧‧運算部24a‧‧‧蓄尿量計算部24b‧‧‧允許值計算部24c‧‧‧第1比較部25‧‧‧輸出部26‧‧‧警報部27‧‧‧顯示部
