Patent ID: 8420917

Claim:
A musical instrument, comprising: a musical instrument body; a revolving board in a plate shape supported on the musical instrument body in a rotatable manner rotating about a first axis and is switched between a close state and an open state; a bearing bar, wherein an end of the bearing bar is supported on the revolving board in a rotatable manner rotating about a second axis; and a guiding member having a loop-shaped guiding channel for guiding an other end of the bearing bar, wherein the guiding channel comprises an inner peripheral wall forming an inner peripheral of the guiding channel, the inner peripheral wall comprises: a guiding inclined plane, located above the other end of the bearing bar in a case which the other end of the bearing bar is located on a vertical line passing through the second axis when the revolving board is down in the close state and is inclined upward while the other end of the bearing bar moving away from the first axis; and a first concave surface, located above the guiding inclined plane, and recessed downward, and the revolving board maintains the open state by engaging the other end of the bearing bar with the first concave surface.