To provide a beverage can improved from the sanitary viewpoint.

A straw 9 wrapped on a drinking mouth of a can upper section is set in place of a pull-can type opening to improve the can from the sanitary viewpoint. The straw is raised by 90° and an air introduction inlet 6 is unsealed simultaneously and a waterstop valve 8 shutting off the straw in the can from a straw outside is destroyed at the same time to integrate the straws inside and outside and make it possible to drink drinking water in the can. In the case of the drinking water or the like, the straw of standard size can be used, while the lateral width of the straw is widened for a beer can or the like to increase the flow rate.