Game system

The present invention relates to a signal generating device attachable to a game system in which a game is played in accordance with signals inputted from the outside and particularly to a signal generating device for generating signals in response to hitting and swinging motions made by a game player moving his hand. In a handy signal generating device attachable to a game system and holdable in hand of a game player, an impact sensor for generating a signal in response to a hitting motion made by the game player and an acceleration sensor for generating a signal in response to a swinging motion made by the game player are built in a signal generating unit (first to fourth layer to and a cover ). Accordingly, there can be provided a signal generating device which enables the game player to play a game while relatively freely moving his body.