PURPOSE: To provide an inverting jig of weather strips capable of inverting these weather strips at an arbitrary angle and simultaneously working the weather strips from a specified direction.

CONSTITUTION: Weather strip mounting members 45 which turn integrally with respective shafts 40 and mount the weather strips 20 at their front ends and oscillating arms 50 are pendently installed to these shafts 40. The front ends of these oscillating arms 50 are connected to forward and backward moving members 60 which move back and forth almost rectilinearly in the direction perpendicular to the shafts 40.