To provide a method for checking a bending action program of a bender robot which is able to perform teaching even the point which is not previously set up as a point needed for teaching or the point passed.

While the action program which commands the action of the bender robot, is operated, a designated check point capable of stopping the bender robot is, a reverse confirmation position between the set up preceding designated check point and the next designated checkpoint that allows returning freely to the prior designated checkpoint, is set up. When the bender robot needs teaching operation while acting, reverse check designation is executed at the place between the prior designated check point and the reverse confirmation position, the bender robot judges whether the reverse check designation exists or not when reaches the reverse confirmation position, in the case that the reverse check exists, the bender robot returns to the prior designated check point to perform teaching operation.