Provided is a power transmission device 22-1 that is incorporated into a cooking robot equipped with a cooking attachment, the power transmission device 22-1 comprising an output member 70-1 made of a material with lower thermal conductivity than another member 90 of the power transmission device 22-1. As a result, the cooking heat transmitted from the cooking attachment side to the output member of the power transmission device can be blocked as much as possible by the output member, and the transmission of cooking heat from the output member to other parts of the power transmission device by heat conduction can be made difficult.

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