To provide a therapy apparatus capable of improving the healing capacities of a broken part and a damaged part of the muscle by impressing a potential difference to an affected part based on the Wolff's Law.

This suction therapy apparatus 1 is formed by having a suction cup 2 sucking the skin 5 of a human body, and a suction device 4 forming a negative pressure in an inner space 22 of the suction cup 2; and is further provided with an outer conductor 30 coming into contact with the skin 5 outside the suction cup 2, an inner conductor 31 coming into contact with the skin 5 inside the suction cup 2, and a potential impressing device 3 impressing a potential of a positive electrode to the outer conductor 30 and impressing a potential of the negative electrode to the inner conductor 31. The affected part positioned therebetween is treated by the potential difference.