Abstract: The present invention relates to a hole forming device for pierced earrings which comprises a body of an earring including a pin member which has a tapered end part and penetrates an ear and an ornamental member integrally connected to the other end part of the pin member which is exposed on the front side of the ear; a clip for gripping the end part of the pin member behind the ear; and a guide member having a through hole and a projecting part at one end toward the front side of the ear.The present invention provides a hole forming device for pierced earrings whereby various earrings can be replaced and users' various desires can be satisfied even while a hole is being formed.