Radiation-irradiation device comprising a first arm, a second arm, and main body surface regulating a rotational movement of the second arm

A radiation-irradiation device comprising:

• a leg unit, including a base and wheels, that is capable of traveling on a device-placement surface;
• a radiation source that irradiates a subject with radiation;
• an arm unit, including a first arm and a second arm, that supports the radiation source;
• a main body that stands on the leg unit and supports the arm unit;
• and
• a raising/lowering mechanism, including a cylinder and a shaft, that raises and lowers the arm unit relative to the main body,
• wherein the first arm of the arm unit is connected to the radiation source, and the arm unit further includes a first rotational moving portion that connects the first arm to the second arm so as to allow the first arm and second arm to be rotationally movable relative to each other, and a second rotational moving portion that connects the second arm to the raising/lowering mechanism so as to allow the second arm to be rotationally movable relative to the raising/lowering mechanism;
• and
• wherein a support surface of the main body on which the arm unit is supported regulates a rotational movement of the second arm from an initial rotational movement position, which is performed using the second rotational moving portion, in a case in which the arm unit is positioned at a position other than a first position, where the arm unit is raised or lowered by the raising/lowering mechanism.