To provide an electromagnetic contactor capable of performing display of a working state with cost hike restrained and avoiding risk by manual inputting.

An arc-extinguishing device 23 structured as a different body from a main body frame is arranged on the frame 2 so as to cover a main movable contact piece, a protruded part 7b performing movement display penetrating through a window frame of the arc-extinguishing device 23 is integrally fitted to a supporting frame 7d, and a display hole 3b displaying the protruded part 7b is formed at the window frame of the arc-extinguishing device 23.