An ultrasound emission device (10) includes, within a case (12) having a watertight structure, an ultrasonic transducer (20), a power source (16), and a control unit (17). The ultrasonic transducer (20) is attached to the inside of the case (12) via an acoustic matching layer (22). An acoustic scattering layer (24) is provided on the outside of the case (12). The acoustic scattering layer (24) is formed from a material for which the acoustic impedance difference with water is large. One example of the acoustic scattering layer (24) is a wire net. High-strength ultrasonic waves (19) generated by the ultrasonic transducer (20) are scattered by the acoustic scattering layer (24) and emitted, as low-strength ultrasonic waves (21), to a wide area of a human body. The ultrasound emission device (10) can be floated on water inside a water tank (52), or can be used in the water inside the water tank (52). With the present invention, ultrasound stimulation can be applied to the bones of nearly the entirety of the human body or of the entire body of a mammalian animal.本發明是關於一種超音波照射裝置和超音波照射系統，使用結構簡單價格低廉的小型裝置，可以盡可能均勻地照射弱超音波能量(LIPUS)。本發明具有能夠產生超音波的超音波振子(20)、驅動超音波振子(20)的電源(16)以及控制部(17)。保持超音波振子(20)以及驅動部的殼體(12)上裝備有由超音波擴散材料構成的聲擴散層(24)，從超音波振子(20)發出的高強度超音波(19)在放射面被擴散，變成單位面積強度低的超音波(21)從而大面積照射。本發明設置有能夠容納哺乳動物或人、且盛有水的水槽(52)，並在水槽(52)的水面或水中的至少任一處設置有至少一個超音波照射裝置(10)，在水槽(52)的水面或水中連續且自動地照射具有至少兩種頻率和兩種脈衝重複頻率的多重超音波，再利用水槽和水面的反射，對哺乳動物或人的全身或部分實施低強度超音波刺激。
