Sharpener for pencils with a shaft surrounding a hard pencil lead, which has a cross-section which has different dimensions in two orthogonal spatial directions, with a sharpener housing (12) in which a positive guide device (14) for rotatingly driving a holding device (16) for the person to be sharpened A pencil along a defined movement path in relation to the two orthogonal spatial directions is provided in the sharpener housing (12), characterized in that the holding device (16) is provided for the temporary non-rotatable reception of an adapter (24) which is provided with a guide channel (26) for the to be sharpened pencil.
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