Shōka (正嘉) was a Japanese era name (年号, nengō, lit. "year name") after Kōgen and before Shōgen. This period spanned the years from March 1257 to March 1259.[1] The reigning emperor was Go-Fukakusa-tennō (後深草天皇).[2]
Change of era
1257Shōka gannen (正嘉元年): The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced in Kōgen 2.