Body is imitated in order to provide a kind of Breast Echo of training for being suitable for Breast Echo inspection, either all close to actual breast in terms of the sense of touch in terms of supersonic transmission characteristic, when scanning probe, and the ultrasound video close to actual breast can be obtained. Imitative body (10) system has: simulated from ultrasonic transmission characteristic in terms of the pectoralis major simulation layer (21) of the pectoralis major of human body, lamination what pectoralis major simulation layer and in terms of ultrasonic transmission characteristic the fat deposit in the Hou gap of simulation human body mammary gland Hou gap fat mimetic layer (22). Imitative body is further equipped with: the skin-mimicking layer (23) of the skin layer of breast surface is simulated in terms of the ultrasonic transmission characteristic, the subcutaneous fat simulation layer (24) that is bonded the inside of what skin-mimicking layer and simulates the subcutaneous fat of breast and configure between mammary gland Hou gap fat mimetic layer and subcutaneous fat simulation layer and at least from aforementioned ultrasonic transmission characteristic in terms of simulate breast gland leaf body a plurality of gland leaf analogue bodies (25). It is arranged in a plurality of gland leaf analogue bodies (25): simulates at least one lesion simulation part (T1 (T2 ~ T4) of the lesion of breast in terms of from ultrasonic transmission characteristic.為了提供一種適用於乳房超音波檢查的訓練之乳房超音波仿體，不管是超音波的傳遞特性方面、探頭掃描時的觸感方面都接近實際的乳房，而能獲得接近實際的乳房之超音波影像。仿體(10)係具備：從超音波傳遞特性方面模擬人體的胸大肌之胸大肌模擬層(21)、積層於胸大肌模擬層且從超音波傳遞特性方面模擬人體的後間隙的脂肪層之乳腺後間隙脂肪模擬層(22)。仿體進一步具備：從超音波傳遞特性方面模擬乳房表面的皮膚層之皮膚模擬層(23)、貼合於皮膚模擬層的內側且模擬乳房的皮下脂肪之皮下脂肪模擬層(24)、及配置在乳腺後間隙脂肪模擬層和皮下脂肪模擬層之間且至少從前述超音波傳遞特性方面模擬乳房的腺葉體之複數個腺葉模擬體(25)。在複數個腺葉模擬體(25)設置：從超音波傳遞特性方面模擬乳房的病變之至少1個病變模擬部(T1(T2~T4)。
