A medical treatment apparatus (210) is an apparatus for treating a living tissue by heating at a target temperature. The apparatus includes a heat transfer portion (266, 270), a heating chip (300), a temperature measurement unit (440) and a control unit (290). The heat transfer portion comes into contact with the living tissue and transfers heat to the living tissue. The heating chip includes a heating region (313, 307), is joined to the heat transfer portion, and heats the heat transfer portion by inputting energy to the heating region. The temperature measurement unit acquires a temperature of the heating region. The control unit controls a temperature of the heat transfer portion to the target temperature by controlling the temperature of the heating region to a temperature differing from the target temperature by an offset value which changes in accordance with an amount of energy input to the heating region.
