A contact mechanism, comprising a fixed contact and a movable contact that are inserted in a current-carrying path, wherein the movable contact has a conductive plate that is supported by a movable part and has contact point parts (3b, 3c) on both ends of a front or rear surface thereof, wherein the fixed contact has two U-shaped conductive plate parts (2o, 2p), each U-shaped conductive plate part is integrally formed by a first conductive plate part (2c, 2d) that supports a fixed contact point part (2a, 2b) facing the respective contact point part (3b, 3c) of the conductive plate and extends outward from the respective end of the conductive plate in parallel with the conductive plate, a second conductive plate part (2e, 2f) extending from an outer end part of the first conductive plate part (2c, 2d) through the outside of an end part of the conductive plate, a third conductive plate part (2m, 2n) extending inward from an end part of the second conductive plate part (2e, 2f) in parallel with the conductive plate, and wherein the fixed contact is connected to an external connecting terminal (2i, 2j) extending outward from an upper end of each of the respective U-shaped conductive plate parts (2o, 2p) in parallel with the conductive plate, wherein each of the U-shaped conductive plate parts (2o, 2p) of the fixed contact is surrounding its respective contact point part (3b, 3c) of the conductive plate, such that at least either the fixed contact or the movable contact generates a Lorentz force, which acts against an electromagnetic repulsion, based on a magnetic field that is formed with respect to a current flowing through the moveable contact, wherein the electromagnetic repulsion is generated between the fixed contact and the movable contact in an opening direction upon application of the current, and the movable part that supports the movable contact is coupled to an upper end of a movable core of an operating electromagnet, so that the movable contact is brought into contact with the fixed contact when a current is supplied to the operating electromagnet. wherein the movable contact has a conductive plate that is supported by a movable part and has contact point parts (3b, 3c) on both ends of a front or rear surface thereof, wherein the fixed contact has two U-shaped conductive plate parts (2o, 2p), each U-shaped conductive plate part is integrally formed by a first conductive plate part (2c, 2d) that supports a fixed contact point part (2a, 2b) facing the respective contact point part (3b, 3c) of the conductive plate and extends outward from the respective end of the conductive plate in parallel with the conductive plate, a second conductive plate part (2e, 2f) extending from an outer end part of the first conductive plate part (2c, 2d) through the outside of an end part of the conductive plate, a third conductive plate part (2m, 2n) extending inward from an end part of the second conductive plate part (2e, 2f) in parallel with the conductive plate, and wherein the fixed contact is connected to an external connecting terminal (2i, 2j) extending outward from an upper end of each of the respective U-shaped conductive plate parts (2o, 2p) in parallel with the conductive plate, a first conductive plate part (2c, 2d) that supports a fixed contact point part (2a, 2b) facing the respective contact point part (3b, 3c) of the conductive plate and extends outward from the respective end of the conductive plate in parallel with the conductive plate, a second conductive plate part (2e, 2f) extending from an outer end part of the first conductive plate part (2c, 2d) through the outside of an end part of the conductive plate, a third conductive plate part (2m, 2n) extending inward from an end part of the second conductive plate part (2e, 2f) in parallel with the conductive plate, and wherein the fixed contact is connected to an external connecting terminal (2i, 2j) extending outward from an upper end of each of the respective U-shaped conductive plate parts (2o, 2p) in parallel with the conductive plate, wherein each of the U-shaped conductive plate parts (2o, 2p) of the fixed contact is surrounding its respective contact point part (3b, 3c) of the conductive plate, such that at least either the fixed contact or the movable contact generates a Lorentz force, which acts against an electromagnetic repulsion, based on a magnetic field that is formed with respect to a current flowing through the moveable contact, wherein the electromagnetic repulsion is generated between the fixed contact and the movable contact in an opening direction upon application of the current, and the movable part that supports the movable contact is coupled to an upper end of a movable core of an operating electromagnet, so that the movable contact is brought into contact with the fixed contact when a current is supplied to the operating electromagnet.