Opening and closing door for air conditioner and air conditioner

The opening and closing door comprises a door body, the length of the door body is larger than the width of the door body, and the wall thickness of the center of the door body in the width direction is larger than the wall thickness of the two ends of the door body in the width direction. According to the opening and closing door for the air conditioner, the wall thickness of the central position of the door body in the width direction is large, the deformation resistance of the door body can be improved, and the reliability of opening and closing the door is improved.