This is a sales place for vegetables, fruits, flowers and so on.
It is usually just a shelf and a roof, without any doors or windows.
There are no employees or guards, but it isn't a vending machine either.
The quality of the products are good, and prices are usually 100 or 200 yen for 1 pack.
They are much cheaper than the market price.
You should put the money into the coin box yourself, honestly.
These days, the coin boxes are locked. (No Change Given)
When I was a kid I use to see simple boxes or just cans with no locked. (You could get the change yourself long time ago.)
You can see these shops by the roadside or in the parking lots around the Japanese countryside (agricultural area), especially in Kochi 高知 Prefecture of Shikoku 四国.
Fans of home-grown vegetables and local farms use this unmanned food stand.
Most consumers are honest.
But, I have heard that some people short-change the stand or steal the money and food. That is too bad!
良心市 ryoushin-ichi means
良心 ryoshin: conscience, honesty
市 ichi: market, shop
It is also called a 無人販売所 mujin-hanbaijo, means a self-service (unmanned) stand.