The present invention provides a method and a device for evaluating the straightness of a metallic fine wire capable of accurately evaluating the straightness of the metallic fine wire. A gold wire having a specified length is floated on pure water under the state in which at least one end of the gold wire is brought to a free end. The straightness of the gold wire is evaluated on the basis of theshape of the gold wire on the liquid surface of pure water. It is preferable that the gold wire floated on a liquid is image-sensed, and the straightness of the gold wire is evaluated from the staticimage. The device has pure water floating the gold wire on its liquid surface and a pad storing pure water.