Cutter wheel, manufacturing method for same, manual scribing tool and scribing device

A cutter wheel for scribing a brittle material substrate, comprising:

• a disk made of metal or sintered diamond having an outer peripheral edge having a V-shape formed by two slanted surfaces that converge in a direction toward the outer peripheral edge and having an outer diameter of 1 mm to 3 mm;
• and
• a plurality of notches provided in the outer peripheral edge, each of the plurality of notches having a V-shape with an angle of 30°-120° in a plane that contains the radii of the cutting wheel and a depth of the notches is 1 μm to 5 μm, a pitch of the notches being 200 μm or more,
• wherein ridge line parts are formed between adjacent notches by the two slanted surfaces that converge in the direction toward the outer peripheral edge, the ridge line parts being longer than a length of the notches in the direction of the circumference between adjacent notches.