Can-top and can.

Problem to be solved. To provide a can-top and a can of which opening operation can be performed easily and reliably, and vent holes can also be opened at the same time by a series of tabs maneuvers that open the main opening part. Solution. At initial breaking operation, in which a finger hook 33 of a tab 30 is raised, and a tab nose portion 32 is pushed into a first planned opening part W1 using a rivet part 6 as fulcrum, an initial break part 11 of a first score 10, as well as, an initial break part 21 of a second score 20 are configured to be broken. After the initial breaking, the tab 30 is further raised to break the first score 10 from the initial break part 11 to an end part 12. Then, at returning operation, in which the tab 30 is returned to...