Opening/closing body opening/closing device

An opening and closing body opening and closing device, comprising:

• a carrier plate that carries an opening and closing body;
• and
• a guide rail that has a curved shape and guides movement of the carrier plate in a lifting and lowering direction of the opening and closing body, wherein:
• the carrier plate comprises, at an upper end portion of the carrier plate, a water holding section that holds water reaching the upper end portion from above the carrier plate, and
• the water holding section comprises:
• a water receiving section that faces upward and receives a reaching water,
• an outflow preventing section provided with a preventing surface that faces a side of the water receiving section and prevents the water from flowing out to the guide rail, and
• on a side opposite to the side of the guide rail in the water receiving section, an extension surface that extends to a side opposite to the guide rail and inclines upward with respect to the water receiving section, and
• when the carrier plate moves downward from a position on an upper end side of the guide rail, the carrier plate moves so that the extension surface inclines downward, and
• the water receiving section is placed between the preventing surface of the outflow preventing section and the extension surface in a thickness direction of the carrier plate.