To obtain a grove for shampoo for beauty, acupressure and massage by forming fingertip parts of the grove at the reverse sides of the nails, into thick shapes and arranging permanent magnet fragments therein.

The objective grove is obtained by forming fingertip parts 1a of the grove 1 composed of a synthetic resin, a rubber material, etc., and formed out of mesh at the reverse sides of the positions allowing the each nail to be inserted, into thick shapes and arranging one permanent magnet fragment 2 at the center part of the each fingertip part 1a.