Blade replacing device

A blade replacing device used in a cutting apparatus that cuts a workpiece by an annular cutting blade mounted to a tip part of a spindle through a blade mount,

• the blade mount having a cylindrical boss section which projects in an axial direction of the spindle in a state of being fixed to the tip part of the spindle to be inserted into a through-opening of the cutting blade, and an annular flange section which is located on a base end part side of the boss section, projects to outside relative to the boss section in a radial direction of the boss section, and is capable of making contact with the cutting blade in a state in which the cutting blade is inserted in the boss section,
• the blade replacing device comprising:
• a holding section that detachably holds one surface side of the cutting blade;
• a moving section that relatively advances and retracts the holding section in a state of holding the cutting blade relative to the spindle in the axial direction of the spindle, and positions the holding section at least at a mounting position at which the other surface located on an opposite side of the one surface of the cutting blade is equal to or less than a predetermined distance from the flange section of the blade mount, and at a released position at which the cutting blade is spaced from the blade mount;
• and
• a thickness information acquisition section for acquiring information concerning a thickness of the cutting blade,
• wherein the mounting position of the holding section is adjusted according to the thickness of the cutting blade acquired by utilizing the thickness information acquisition section.