Keyboard lid opening and closing mechanism for keyboard musical instrument and keyboard musical instrument

A keyboard lid opening and closing mechanism for a keyboard musical instrument comprising:

• a keyboard lid including a front lid for covering over a keyboard placed between arms arranged opposite to each other in the vicinity of the front left and right ends of the keyboard musical instrument, and a rear lid having a front end connected with the rear end of the front lid by a connecting portion in a foldable manner into a reverse V-shape, the keyboard lid being movable between a position of covering over the keyboard (lid closed position) and a position of being housed inside the keyboard musical instrument (lid open position);
• and
• a keyboard lid guide portion for guiding the keyboard lid between the lid closed position and the lid open position, wherein the keyboard lid opening and closing mechanism further comprises:
• a reverse V-shape forming portion for folding the keyboard lid moving from the lid closed position to the lid open position into a reverse V-shape configuration at the connecting portion;
• a rotation support portion for supporting the rear lid of the keyboard lid folded into a reverse V-shape configuration at the connecting portion by the reverse V-shape forming portion when the keyboard lid moves from the lid closed position to the lid open position, thereby rotating the rear lid around the support portion;
• and
• a keyboard lid stop portion for stopping the keyboard lid while moving in the lid open position.