A method of inserting terminal in which a problem that time for search varies with relative position between the wires and the connector is eliminated, and the position of the connector housing can flexibly be determined. The method of inserting terminal according to the present invention comprises the steps of: correcting a relative position of a terminal insertion head against a connector housing while two positions on front end portion on an engagement side of the connector housing being image-processed by a television camera; and inserting a terminal with wire from a rear portion of the connector housing by using the terminal insertion head.