To provide a technology for improving productivity in a yarn winder, by eliminating non-coincidence between really required work and work performed by an operator.

This yarn winder includes a first abnormal display and reset part for switching to abnormal display from steady display with the occurrence of an abnormal state caused by at least a yarn feed source as a starting point, switching to the steady display by operating in the abnormal display and switching a machine base to an operation state from a stopping state, and a second abnormal display and reset part for switching to the abnormal display from the steady display with the occurrence of the abnormal state caused by at least a winding bobbin as a starting point, switching to the steady display by operating in the abnormal display and switching the machine base to the operation state from the stopping state.