An endoscope reprocessor includes a treatment tank for accommodating an endoscope, a treatment tank temperature measuring section for measuring a temperature of a liquid in the treatment tank, a medicinal solution tank for storing a medicinal solution, a heating section for heating the medicinal solution inside the medicinal solution tank, a first transfer section for transferring a part of the medicinal solution to the treatment tank from the medicinal solution tank, a second transfer section for transferring the medicinal solution in the treatment tank to the medicinal solution tank, and a control unit configured to cause the medicinal solution to circulate between the treatment tank and the medicinal solution tank, when the measurement result by the treatment tank temperature measuring section is lower than a predetermined threshold value.
