Chamfering apparatus and chamfering method

A chamfering apparatus for forming a tapered surface on an edge portion formed by two surfaces of a workpiece, the workpiece allowing a laser beam to be transmitted therethrough, the tapered surface extending in a chamfering direction that is inclined relative to one of the two surfaces,

• the chamfering apparatus comprising:
• a laser beam transmissive member that allows a laser beam to be transmitted therethrough and that contacts the one surface of the workpiece, the laser beam transmissive member including an inclined surface that is inclined in an opposite direction to the chamfering direction relative to the one surface in a state where the laser beam transmissive member is in contact with the one surface;
• and
• a laser machining head configured to emit an ultrashort pulse laser beam for forming a laser filament inside the edge portion to the inclined surface of the laser beam transmissive member, such that the ultrashort pulse laser beam is transmitted through the laser beam transmissive member, incident on the one surface of the workpiece from the laser beam transmissive member, transmitted through the edge portion in the chamfering direction, and forms the laser filament inside the edge portion, the laser filament extending in the chamfering direction.