A working protection cover 1, 8 for preventing a vehicle body from becoming damaged during an automobile assembly line operation is free from the possibility of easily slipping off position upon mere contact of an operator with the cover, and has good durability. The working protection cover 1, 8 comprises a thermoplastic resin sheet 9 and a cloth-made sheet 10 bonded to the back of the thermoplastic resin sheet 9. The working protection cover 1, 8 has a non-slip tape 17 bonded to the back thereof, the non-slip tape 17 being made from a foam material made from a polyolefin resin and a synthetic rubber in combination. The working protection cover 1, 8 is fitted with a locking element 24, 40 for locking the cover 1, 8 to a vehicle body.