A hadron therapy apparatus comprises a gantry structure (16) designed for rotating about an axis of rotation (18) and for delivering a hadron beam onto a target volume located at an isocenter (22) on the axis of rotation (18). This gantry structure (16) comprises a beam delivery line (24) with an inlet section (26) receiving the hadron beam in a direction essentially parallel to the axis of rotation (18) and deviating it away from it, and an outlet section (28) delivering the hadron beam so that the axis of the beam intersects the axis of rotation at the isocenter (22). The inlet section (26) and the outlet section (28) are supported in a cantilever manner by a pivotable support arm (32), which is supported in a support structure (34), so as to be pivotable about the axis of rotation (18).
