The invention relates to a container closure device, for example, a bottle cork for containers such as bottles for sparkling wine, soda, and other carbonated beverages. The usage is such that first, a fitting member rotatably attached to the main body is rotated and a tight seal part of the body is applied to the bottle mouth. Thereafter, the fitting member is brought back to the original position while pressing the body to the bottle mouth, then is engaged with the fitting engagement part provided in the bottle mouth, and then the fitting member is fitted with the bottle mouth, thereby closing the bottle mouth.