Provided is a neutron capture therapy system which can improve a therapeutic efficacy. A neutron capture therapy system (1) in which a patient (S) is irradiated with a neutron beam (N) includes an irradiation chamber (3) which is surrounded by a shielding wall (W) blocking the neutron beam (N) from being radiated from the inside to the outside of the chamber and in which the patient (S) is arranged inside the chamber and is irradiated with the neutron beam (N), a neutron beam irradiation unit (8) that irradiates the inside of the irradiation chamber (3) with the neutron beam (N), a shielding door (D1) that closes a gate (3b) provided in the shielding wall (W), a medicine supply pump (17) that supplies a medicine to the patient (S), and a medicine supply tube (18) through which the medicine is introduced from the medicine supply pump (17) to the patient (S) arranged inside the irradiation chamber (3). The medicine supply pump (17) has a control unit (17a) which controls a supply quantity of the medicine and is arranged outside the irradiation chamber (3).
