The occasion where the work where the scribe line is cut on the surface is broken, rub to back of the work due to break method of the work which can prevent the fact that the chipping it occurs is offered. As for break method of work 5 of this invention, the work gluing process which sticks the back of the work 5 to expansion and contraction possible seat 9 and the seat 9 to which it can stick work 5 the seat pulling process which pulls and when seat 9 is pulled, the work dividing process which makes scribe line arrive 5c to back of the work 5 and, it has. By the pulling power of seat 9, when work 5 is divided, because work 5 is detached simultaneously, the work 5 which is divided rubs to decrease, the fact that chipping occurs on back can be prevented. Furthermore, to pull in work and 5 pull by the fact that power is given, because power becomes assistance of work dividing, to divide work 5 by, it is possible smaller power.
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