An electromagnetic contactor comprising: a contact device including a pair of fixed contacts (111, 112) disposed so as to maintain a predetermined distance and a movable contact disposed so as to be connectable to and detachable from the pair of fixed contacts (111, 112), wherein an insulating cover, covering all except contact portions that come into contact with the movable contact, is mounted on the pair of fixed contacts (111, 112), wherein the pair of fixed contacts (111, 112) include a support conductor portion supported maintaining a predetermined interval with the upper surface of a contact housing case, and a C-shaped portion formed in a C-shape of an upper plate portion connected to an end portion of the support conductor portion inside the contact housing case, an intermediate plate portion extending downward from a side of the upper plate portion opposite to another support conductor portion, and a lower plate portion, on the upper surface of which is formed a contact portion, extending from the lower end of the intermediate plate portion to the other support conductor portion side, wherein the insulating cover is configured so as to expose at least the contact portions of the C-shaped portion and to cover a surface opposing the movable contact and side surfaces connected to the opposing surface, wherein the insulating cover includes an L-shaped portion that covers the inner surfaces of the upper plate portion and intermediate plate portion of the C-shaped portion of the pair of fixed contacts (111, 112), side plate portions that extend from side edges of the L-shaped portion so as to cover side surfaces of the C-shaped portion, characterized in that the insulating cover further includes a fitting portion, extending inward from upper ends of the side plate portions opposing the support conductor portion, that fits onto a small diameter portion formed on the support conductor portion, and a snap-fitting portion that engages with a protrusion formed on the lower surface of the lower plate portion of the C-shaped portion. a contact device including a pair of fixed contacts (111, 112) disposed so as to maintain a predetermined distance and a movable contact disposed so as to be connectable to and detachable from the pair of fixed contacts (111, 112), wherein an insulating cover, covering all except contact portions that come into contact with the movable contact, is mounted on the pair of fixed contacts (111, 112), wherein the pair of fixed contacts (111, 112) include a support conductor portion supported maintaining a predetermined interval with the upper surface of a contact housing case, and a C-shaped portion formed in a C-shape of an upper plate portion connected to an end portion of the support conductor portion inside the contact housing case, an intermediate plate portion extending downward from a side of the upper plate portion opposite to another support conductor portion, and a lower plate portion, on the upper surface of which is formed a contact portion, extending from the lower end of the intermediate plate portion to the other support conductor portion side, wherein the insulating cover is configured so as to expose at least the contact portions of the C-shaped portion and to cover a surface opposing the movable contact and side surfaces connected to the opposing surface, wherein the insulating cover includes an L-shaped portion that covers the inner surfaces of the upper plate portion and intermediate plate portion of the C-shaped portion of the pair of fixed contacts (111, 112), side plate portions that extend from side edges of the L-shaped portion so as to cover side surfaces of the C-shaped portion, characterized in that the insulating cover further includes a fitting portion, extending inward from upper ends of the side plate portions opposing the support conductor portion, that fits onto a small diameter portion formed on the support conductor portion, and a snap-fitting portion that engages with a protrusion formed on the lower surface of the lower plate portion of the C-shaped portion.