Abstract: The present invention is directed to an electromagnetic switch that includes a casing in which are received a yoke, a bobbin, a coil, a plunger, and contacts. The plunger is formed of an electrically conductive material and the casing is formed of an insulating material. The casing comprises a square box-shaped body and a covering member fitted in an open end of the body. The yoke includes a sheet member having a generally U-shaped section and having opposite end portions between which a portion of the covering member is interposed. The opposite end portions are formed in part into at least one pair of inwardly extending lugs force-fitted in the above portion of the covering member. The covering member has a recess formed in a side surface thereof opposed to the contacts. The covering member has a partition wall formed thereon and separating the contacts from leader ends of the coil.