Vodkama is disclosed. Board marker of the present invention, the user grips, the nip protruding body; An ink core housed inside the body and wrapped with a waterproof skin; And a dial mounted to the body so as to be rotatable only in one direction, and the ink core is squeezed by turning the dial. According to the present invention, after the ink core is squeezed, the reverse rotation of the dial is prevented, the buckling of the ink core is prevented, the board marker is made to be squeezed equally along the longitudinal direction of the ink core, and the ink core is simultaneously compressed in the radial direction and the longitudinal direction. It can be provided.
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