Yuko's Shop is a location in xxxHolic. It is where Yuko Ichihara resided, and where Yuko, and later, Watanuki, commonly grants wishes to those customers who can enter the shop. The shop appears choosy about its clientelle, as it would seem only those who need a wish granted can actually see and enter the shop.
In chapter 157, due to the collapse of the time-space continuum (most likely triggered by the events in Tsubasa), the wards in the shop break down. In chapter 167, the shop begins to disappear as well, although Yuko states that the store room must be protected 'for the day that must come'.
After Yuko's death, Watanuki takes over the shop, granting wishes and waiting for Yuko's return.