A lid is capable of easily taking out contents from an opening portion thereof, while securing sealability of a container. The lid includes a top lid made of a paper-based material, the top lid including: an opening portion communicating between the inside and the outside of the top lid; a lid piece formed to be capable of opening or closing the opening portion; and a holding portion for holding the lid piece in a state where the opening portion is opened; and the lid includes a holding reception portion configured to hold the holding portion in a state where the opening portion is opened.