PROBLEM TO BE SOLVED: To provide a treatment device for boron neutron capture therapy capable of accurately reproducing a treatment plan and achieving high safety properties, and a control method thereof.SOLUTION: A treatment device 10 for boron neutron capture therapy includes: an irradiation unit 12 for irradiating generated neutrons to a tumor of a patient； a blood sampling unit 19 for sampling blood of the patient in real time during treatment； a blood boron concentration measurement unit 20 for measuring the blood boron concentration from the sampled blood； a cell boron concentration calculation unit 51 for calculating the boron concentrations in a normal cell and a tumor cell from the measured blood boron concentration based on the correlation held in advance with the blood boron concentration； an exposure dose evaluation unit 54 for predicting an exposure dose of the patient caused by the irradiation of neutrons using the respective calculated boron concentrations in the normal cell and the tumor cell； and a control amount setting unit 55 for setting an amount of control including neutron irradiation time and neutron irradiation intensity according to the predicted exposure dose.SELECTED DRAWING: Figure 1
