Problem that the width direction end portion of the opening / closing body comes into contact with the guide rail to prevent damage.The opening and closing body 10 for closing and closing the spaceA guide rail 20 surrounding the end side in the width direction in the opening / closing body 10 and guiding it in the opening / closing directionIn an open / close device having a guide rail support member 30 fixed to an immovable position to support the guide railThe guide rail support memberAccompanying the tilting of the guide rail 20 in the thickness direction of the opening and closing bodyA deformation allowance portion a is formed to be deformed in the thickness direction of the opening.Diagram
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