Abstract: An operation is generated in which a robot can perform work without causing interference with a surrounding structure within a movable range of the robot. The robot teaching device relates to a work teaching device that teaches work to a robot that holds and moves a held object. The device includes a teaching pose measurement unit configured to measure and/or calculate a teaching pose that is a pose of the held object during teaching work, and a robot operation generation unit configured to generate a joint displacement sequence of the robot such that a pose of a held object of the same type as the held object whose teaching pose is measured becomes the same pose as the teaching pose.