of the spacer s is placed on the rear portion s2 of the blade b1 with the engaging portion s2 fixed to the rear end of the rest 10 the blade b2 is disposed on the spacer s with its blade edge b2a projecting from the spacer s an area from the blade b2 to the front side 10a of the rest 10 is covered by the guard 20 the pressing blocks 11 of the rest 10 and the inner wall 30a of the cap 30 clamp the front portion of the guard 20 the projections 34 engage the holes 23 the blade b2 and the inner surface of the cap 30 clamp the rear portion the guard 20 is thus secured within the cartridge c1 each of the ribs 22 thus held under tension is kept in contact with the blade b2 between the rear of the blade a edge b2a each rib 22 extends close to the edge b1a forward of the dent 22a in this state each rib 22 applies a downward preload to each edge b1a b2a the operation of the cartridge c1 according to the first embodiment will now be described the cartridge c1 is attached to a holder not shown and the blades b1 b2 and the guard 20 are slid on the user 39 s skin through the opening 31 of the cap 30 the whiskers guided into the rectangular holes 21 of the guard 20 by way of the guides 32 are cut by the blade b1 each whisker having the same hardness as a brass wire with.