The purpose of the present invention is to reduce the load on an operator of a particle beam therapy device. In the present invention, a position/orientation setter (32) moves a movable body, which is at least one mobile element from between an irradiation nozzle (16) and a treatment table (18), and sets a relative position/orientation of the irradiation nozzle (16) and the treatment table (18). A travel path determiner (44) establishes a travel path for the movable body for when the position/orientation of the movable body is made to match one condition different from another condition out of a plurality of stipulated conditions. An assessment value determiner (46) establishes an assessment value for where the position/orientation of the movable body is matched to each of the plurality of stipulated conditions. This assessment value is for where the movable body is being moved along the travel path. An order determiner (48) determines, on the basis of the assessment value, a set order in which to match the position/orientation of the movable body to each of the stipulated conditions. The position/orientation setter (32) moves the movable body along the travel path established by the travel path determiner (44) and matches the position/orientation of the movable body to each of the plurality of stipulated conditions.L'objet de la présente invention est de réduire la charge sur un opérateur d'un dispositif de thérapie par faisceau de particules. Dans la présente invention, un dispositif de réglage de position/orientation (32) déplace un corps mobile, qui est au moins un élément mobile entre une buse d'irradiation (16) et une table de traitement (18), et définit une position/orientation relative de la buse d'irradiation (16) et de la table de traitement (18). Un dispositif de détermination de trajet de déplacement (44) établit un trajet de déplacement pour le corps mobile pour le moment où la position/orientation du corps mobile est amenée à correspondre à une conditi
