To provide a new abrasive material, abrasive and their manufacturing method.

A carbonized material is obtained by carbonizing a cedar material as a raw material at a carbonization temperature of 600°C for a predetermined carbonizing time. A material having been prepared by adjusting the carbonized material so as to have a predetermined particle size range is used in a polishing process of a lens as an abrasive material. A mixture composition with cerium carbide, etc., may be used as an abrasive material, and the carbonized material may be dispersed in water to give a liquid colloid and be used for polishing in the state of dropping. Compared to a conventional abrasive material mainly composed of cerium oxide, this abrasive material can perform highly accurate polishing in a short time and can provide a detoxified abrasion process by purifying a polishing waste liquid.

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