To provide a slot machine capable of improving the properties attracting customers and adding novel entertainment; and a management server and its play method.

This slot machine is provided with an operation switch detecting an operation by a player, a memory storing credit data being usable for a game and numerical data which are convertible into the credit data and whose conversion rate for converting them into the credit data is variable, and a controller. When a lapsed time from detecting the operation of the operation switch last time becomes a prescribed time, the controller executes a process for converting the credit data stored in the memory into numerical data.