Electromagnetic relay

An electromagnetic relay comprising a housing comprising a base part on which an electromagnetic relay main body is mounted, and a cover part covering the electromagnetic relay main body, in which the housing is in a sealed state when a pressure inside the housing is equal to or lower than a predetermined pressure,

• wherein, when the pressure inside the housing is equal to or lower than the predetermined pressure, the cover part and the base part are butted against each other, and the electromagnetic relay comprises a connection passage connecting an abutment part between the cover part and the base part to outside of the electromagnetic relay,
• the electromagnetic relay further comprising a projection protruding from a protruding part, the protruding part protruding toward an inside of the cover part and toward the base part, wherein the projection is engaged with a recess formed at a second protruding part where an external terminal of the electromagnetic relay main body is fixed in the base part,
• wherein the abutment part is an abutment surface composed of a top surface of a second projection of the cover part and a bottom surface of a second recess of the base part,
• wherein the connection passage is formed in such a way that the connection passage penetrates the protruding part in a direction in which the external terminal of the electromagnetic relay main body extends, and
• wherein a heat-radiation part is formed in the housing.