During the Jingkang period in the Song Dynasty, there was a kind of underpants, narrow and close-fitting, with four seams on the left, right and front, tied with a tie, which was called "bento". This is a kind of underwear that has nothing to do with food. This form converged in Shaoxing years, but it returned to its original state in Ding Jing years, mostly starting from Neigong and gradually spreading to the distance.

The word bento originated from the saying "bento" in the Southern Song Dynasty, which originally meant "convenient things, convenient and smooth". After the word was introduced into Japan, it was marked by "sidewalk", "distinguishing road" and "distinguishing place", and then it was introduced into China by the Japanese prefix, specifically referring to bento.

Box lunch is customarily called "bento" in most parts of the mainland, that is, box lunch. In Taiwan Province Province, it is generally called bento, which is generally used for lunch, take-out and work meals. There is no subtle difference in usage between "bento" and "bento", but the usage is different.

The word "bento" first appeared in China during the Southern Song Dynasty, and then was introduced to Japan. The prototype of modern bento appeared in the Taoshan era in Japan (around the second half of the 6th century/kloc-0), that is, bento with food in a special bento box. At that time, celebrities and nobles often took their lunches when they watched flowers and red leaves.

At the beginning of Edo, the lunch was extremely simple, with a few rice balls and a little pickles at most. After the mid-term, the living standards of ordinary people have been greatly improved, and lunch boxes have become luxurious. There are not only "flower lunch", "drama lunch" and "parade lunch", but also "lunch in the play", which was eaten during the intermission of the drama at that time. Now it refers to a lunch with many dishes.