Providing a method for forming an opening of a shape precisely matching the stoma of a patient in a base plate of a stoma device. A method of forming an opening in a base plate of a stoma device according to the present invention comprises a step of printing on a label a filled in part of the same shape as a hole of a shape formed on a template sheet and matching the stoma of a patient a step of sticking the label on which the filled in part has been printed on to a base plate and a step of cutting the base plate along the contours of the filled in part of the label stuck to the base plate.
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