Disclosed is a relay, configured to enhance a retention force by using a yoke iron (b) and an opening group on a top cover (f). The relay includes the yoke iron (b), the top cover (f), a static iron core (c), a primary permanent magnet group, a secondary permanent magnet group, a first movable iron core (d), and a second movable iron core (d). The top cover (f) is provided with a first opening group (h), the first opening group (h) is provided at a position at which the top cover (f) is configured to be in contact with the first movable iron core (d), the first opening group (h) includes at least one first sub-opening, the yoke iron (b) is provided with a second opening group (i), the second opening group (i) is provided at a position at which the yoke iron (b) is configured to be in contact with the second movable iron core (d), and the second opening group (i) includes at least one second sub-opening.