Neutron total and capture cross sections of Am-243 have been measured in Accurate Neutron Nucleus Reaction measurement Instrument at Materials and Life Science Experimental Facility of Japan Proton Accelerator Research Complex with a neutron time-of-flight (TOF) method. The neutron capture cross section in the energy region from 10meV to 100eV was determined using an array of Ge detectors. Three samples with different activities were used for measurements of the capture cross section. The neutron total cross section in the energy region from 4meV to 100eV was measured using Li-glass detectors. Derived cross-section value at neutron energy of 0.0253eV is b for the capture cross section and b for the total cross section.