To the undersurface of a main body 10 having a keyboard 12 operated with player's hands, upper stand portions 72 which are tilted backward and are shaped like a tube are fixed. Lower stand portions 74 are shaped like a tube which is slightly smaller than the upper stand portions 72. The top end of the lower stand portion 74 is inserted into the upper stand portion 72. If the lower stand portions 74 are inserted into the upper stand portions 72 further deeply, the main body 10 is lowered with the main body 10 moving frontward. As a result, even in a case where a player 90 sits on a sofa or the like, the player 90 is allowed to play an instrument in a comfortable posture.