A starter switch (2) comprises a housing (3) extending along an axis (X) that delimits at least one interior space (4), at least one coil (5) housed in said interior space (4), at least one fixed core (10) passed through by a shaft (6) that is movable in translation along the direction of the axis (X) and at least one cavity (12) comprising an electrical connection area, said cavity being separated from the interior space (4) by the fixed core (10). The starter (1) switch (2) comprises at least one sealing device (22) providing a seal between the interior space (4) of the starter (1) switch (2) and the cavity (12) comprising the connection area.