The objective is to obtain a particle beam irradiation apparatus that can perform in a changeable manner the combination of a plurality of parameters in particle beam irradiation, such as the combination of irradiation fields and irradiation position accuracies, and that can perform diverse-variation irradiation. The particle beam irradiation apparatus (58) irradiates a charged particle beam (3) accelerated by a accelerator (54) onto an irradiation subject (11) the particle beam irradiation apparatus (58) includes a scanning electromagnet (1, 2) that scans the charged particle beam (3), and a scanning electromagnet moving apparatus (4) that moves the scanning electromagnet (1, 2) in such a way as to change the distance between the scanning electromagnet (1, 2) and the irradiation subject (11) in the beam axis direction of the charged particle beam (3).
