PURPOSE: To make it possible to attach a printing head to a specified position on a carrier easily and in a short time without the use of tools by causing pairs of stoppers to come in contact with the printing head and the carrier using the energizing force of an elastic element and thereby fixing the printing head to a specified position on the carrier only through the engagement of the elastic element with the printing head.

CONSTITUTION: If an elastic element 5 is engaged with a carrier 1, pairs of stoppers 3,4 come in contact with the carrier 1 and the printing head 2 respectively due to the energizing force of the elastic element 5. Then the printing head 2 becomes fastened to a specified position on the carrier 1. Next if the elastic element 5 is disengaged, the printing head 2 is removed from the carrier 1.