First Hydrostatic Cores (FHCs) are the transient phase between prestellar cores and Class 0 protostars. It is a key to understand the earliest stage of star formation. Recently, some potential candidates of FHCs have been suggested, but not enough to enable statistical property studies. In the talk, I will summarize the papers which propose candidates of FHCs. I will also talk about my recently work on searching FHCs candidates in Perseus molecular cloud.