Guide device and scarfed surface forming method

A guide device which guides a router device, which rotates a cutting tool having an outer peripheral surface on which a cutting portion is formed and cuts a workpiece coming into contact with the cutting portion, in accordance with a surface shape of the workpiece having a curvature in at least a predetermined direction, comprising:

• a guide portion which includes a first through-hole into which the cutting tool can be inserted, and a guide surface which guides an attachment portion of the router device to which the cutting tool is attached in a state where the cutting tool is inserted into the first through-hole along the first through-hole;
• a holding portion which comes into contact with a surface of the workpiece and holds a position of the guide surface with respect to the surface of the workpiece;
• and
• a positioning portion which includes a second through-hole into which a positioning pin positioned in a positioning hole formed in the workpiece is inserted and positions the guide portion at a predetermined position in a radial direction intersecting an axis in which the positioning pin extends in a state where the positioning pin is inserted into the second through-hole,
• wherein the guide surface is formed such that a distance from the surface of the workpiece decreases as the guide surface approaches the second through-hole in a state where the holding portion is in contact with the surface of the workpiece,
• wherein the guide portion is formed to be elastically deformable, and
• wherein in a case where the guide portion is elastically deformed in accordance with the surface shape of the workpiece, the holding portion holds the position of the guide surface with respect to the surface of the workpiece at a position corresponding to the surface shape.