Industrial robot with hollow section

An industrial robot for transferring a transfer object in a vacuum, comprising:

• a hand configured to mount the transfer object;
• an arm to which the hand is connected at a top end of the arm;
• a main body to which a root end of the arm is connected so as to be rotatable;
• and
• a first bearing unit configured to support the arm to be rotatable, at a first joint section that works as a connection section between the arm and the main body;
• wherein, one of the arm and the main body has a first protrusion section that protrudes toward the other of the arm and the main body, at the first joint section;
• the other of the arm and the main body has a first housing section in which a first hollow section for housing the first protrusion section is formed, at the first joint section;
• the first protrusion section and the first housing section are formed of a material having higher thermal conductivity than the first bearing unit has;
• a first thermally-conductive substance, in a liquid state, a semisolid state, or a gel state, is placed in the first hollow section, the first thermally-conductive substance having higher thermal conductivity than the first bearing unit has;
• and
• the main body comprises:
• a heat radiator configured to radiate heat, the heat radiator being formed of a material having higher thermal conductivity than the first bearing unit has, and being positioned in the atmosphere;
• and a connecting section for connecting either the first housing section or the first protrusion section, which the main body has, and the heat radiator, the connecting section being formed of a material having higher thermal conductivity than the first bearing unit has.