An ultrasonic observation apparatus comprising: a plurality of ultrasound probes each configured to transmit to a specimen a transmission echo obtained by converting a transmission drive wave which is an electrical signal, to receive a reception echo reflected from the specimen, and to convert the reception echo into a reception signal which is an electrical signal; a storage unit configured to store, for each ultrasound probe, attenuation (ΔI 1 (f 1 ), ΔI 2 (f 1 )) that is a difference in signal intensity for each frequency between a predetermined waveform (C 1 ) and a waveform (C 2 , C 3 ) obtained by providing the plurality of ultrasound probes with a first transmission drive wave (C 6 ), in order for a waveform of the transmission echo of each of the plurality of ultrasound probes to be the predetermined waveform; a transmission drive wave generating unit configured to generate, for each ultrasound probe, a second transmission drive wave obtained by adding the attenuation to the first transmission drive wave, with reference to the storage unit, in order to transmit to the specimen the transmission echo having the predetermined waveform; a reception signal correcting unit configured to perform a correction for each frequency with reference to the storage unit, by adding the attenuation to the reception signal which is obtained by transmitting to the specimen the transmission echo having the predetermined waveform and by converting the reception echo reflected from the specimen, the transmission echo being obtained by converting the second transmission drive wave that is given by adding the attenuation to the first transmission drive wave; and an image processing unit configured to form image data using the reception signal corrected by the reception signal correcting unit. a plurality of ultrasound probes each configured to transmit to a specimen a transmission echo obtained by converting a transmission drive wave which is an electrical signal, to receive a reception echo reflected from the specimen, and to convert the reception echo into a reception signal which is an electrical signal; a storage unit configured to store, for each ultrasound probe, attenuation (ΔI 1 (f 1 ), ΔI 2 (f 1 )) that is a difference in signal intensity for each frequency between a predetermined waveform (C 1 ) and a waveform (C 2 , C 3 ) obtained by providing the plurality of ultrasound probes with a first transmission drive wave (C 6 ), in order for a waveform of the transmission echo of each of the plurality of ultrasound probes to be the predetermined waveform; a transmission drive wave generating unit configured to generate, for each ultrasound probe, a second transmission drive wave obtained by adding the attenuation to the first transmission drive wave, with reference to the storage unit, in order to transmit to the specimen the transmission echo having the predetermined waveform; a reception signal correcting unit configured to perform a correction for each frequency with reference to the storage unit, by adding the attenuation to the reception signal which is obtained by transmitting to the specimen the transmission echo having the predetermined waveform and by converting the reception echo reflected from the specimen, the transmission echo being obtained by converting the second transmission drive wave that is given by adding the attenuation to the first transmission drive wave; and an image processing unit configured to form image data using the reception signal corrected by the reception signal correcting unit. <EOS>