A treatment device for a medical treatment heats a biotissue. The device includes first and second heat transfer portions which come in contact with the biotissue. The device includes first and second resistance elements which are supplied a power having a first power value and a second power value to heat the first heat transfer portion and second heat transfer portion, respectively. The device includes temperature acquiring section which acquires a first temperature of the first heat transfer portion. The device includes a control section which calculates the first power value based on the first temperature, and determines the second power value corresponding to the first power value. The device includes first and second power supplying sections which supply the power having the first and second power value to the first and second resistance elements, respectively.
