An indoor putting game device includes a main body, a plurality of goal boards with different patterns and ball holes of different numbers optionally selected to be mounted on the main body, and a flexible ball course member wound on a shaft in the main body possible to be pulled out from a front end of the main body. The main body has the shaft for winding the ball course member while not used or releasing it out for use. The goal board can be adjusted in its inclination by optionally inserting position pins in a pair of pinholes in two sidewalls of the main body. So the device can be used in playing putting game in various modes, boosting users' interest in playing and achieving game and exercise effect.