Mounting structure for shielding shell and mounting method therefor

An object of the present invention is to improve shielding performance without increasing the number of bolt fastening operations while suppressing production cost by using a metal plate. The present invention concerns a mounting structure for a shielding shell 70 for covering a connector housing 50 constituting a terminal block to be connected to a motor case. The mounting structure includes a metal plate 30 integrally provided to the connector housing 50 and adapted to attach and fix the connector housing 50 to the motor case by being fastened to the motor case by mounting bolts; a first shielding shell 70A including a pair of overlapping pieces 76 and adapted to cover the front side of the connector housing 50; and a second shielding shell 70B including a pair of fixing pieces 72 and adapted to cover the upper, left and right sides of the connector housing 50. The overlapping pieces 76 and the fixing pieces 72 are in the form of plates extending along the metal plate 30 and fastened together to the motor case by the mounting bolts together with the metal plate 30 while being placed one over the other.