An ultrasound detecting device which detects an ultrasound irradiation position by irradiating an ultrasound pulse to a living body, comprising: one or a plurality of ultrasound wave irradiation transducers configured to transmit ultrasound waves and one or a plurality of signal receiving transducers configured to receive reflective waves of the ultrasound waves irradiated from said ultrasound wave applying transducers; a signal storage unit configured to store a received signal received by said signal receiving transducers; an analysis program for analyzing a stored signal stored by said signal storage unit; a determination program for determining whether or not an obtained reflective wave is obtained from a target of ultrasound wave irradiation by using an analysis result by said analysis program and/or the stored signal; a time range setting program set in advance in said analysis program; and a display unit configured to display one or more selected from a group consisting of said stored signal, said analysis result, and said determination result by said determination program, wherein said analysis program and/or said determination program is configured to make analysis and/or determination by using the fact that information of a frequency and/or voltage parameter of the received signal is different depending on a difference of a reflector within the living body, wherein said analysis program is configured to calculate a ratio between a high-frequency component and a low-frequency component of the frequency distribution in the received signal of the obtained reflective wave, and wherein said time range setting program is configured to determine a range of time for analyzing the received signal and/or a range of time for storing the received signal and/or a range of time for determination by the determination program characterised in that said time range setting program is configured to take an envelope line of a voltage of a reflection signal, and with regard to a waveform of the envelope line having a voltage value A or more at the top, a point at which the voltage returns to a voltage value C when inclination of an envelope line at a voltage value B is positive is set to be a detection start time, a relationship of A ≥ B > C holds for A, B, and C, and a certain time interval starting at the detection start time is set as an analysis target range. one or a plurality of ultrasound wave irradiation transducers configured to transmit ultrasound waves and one or a plurality of signal receiving transducers configured to receive reflective waves of the ultrasound waves irradiated from said ultrasound wave applying transducers; a signal storage unit configured to store a received signal received by said signal receiving transducers; an analysis program for analyzing a stored signal stored by said signal storage unit; a determination program for determining whether or not an obtained reflective wave is obtained from a target of ultrasound wave irradiation by using an analysis result by said analysis program and/or the stored signal; a time range setting program set in advance in said analysis program; and a display unit configured to display one or more selected from a group consisting of said stored signal, said analysis result, and said determination result by said determination program, wherein said analysis program and/or said determination program is configured to make analysis and/or determination by using the fact that information of a frequency and/or voltage parameter of the received signal is different depending on a difference of a reflector within the living body, wherein said analysis program is configured to calculate a ratio between a high-frequency component and a low-frequency component of the frequency distribution in the received signal of the obtained reflective wave, and wherein said time range setting program is configured to determine a range of time for analyzing the received signal and/or a range of time for storing the received signal and/or a range of time for determination by the determination program characterised in that said time range setting program is configured to take an envelope line of a voltage of a reflection signal, and with regard to a waveform of the envelope line having a voltage value A or more at the top, a point at which the voltage returns to a voltage value C when inclination of an envelope line at a voltage value B is positive is set to be a detection start time, a relationship of A ≥ B > C holds for A, B, and C, and a certain time interval starting at the detection start time is set as an analysis target range.