Provided is a cap opener that has many types of diameter sizes of screw-type caps that can be opened and that can be made compact. A pair of right and left first holding surfaces 3 L, 3 R for applying plug opening torque to the large-diameter or medium-diameter cap C are vertically provided on the first surface 2 a of the body plate 2 of the cap opener 1. A pair of left and right second holding surfaces 6 L, 6 R, which are separated almost oppositely to each other, for applying plug opening torque to the medium-diameter or small-diameter cap, are vertically provided on the second surface 2 b of the body plate 2. The front part of the intermediate line extends approximately linearly in the direction from the front part 2bx of the second surface 2 b toward the rear part 2by side in the middle line in...

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