The present invention relates to a jig device for serration processing. More specifically, the jig device has a configuration capable of performing both of a centering operation and a jigging operation in a pipe or a conduit provided in the jig device. Through configuration including a work handle and a bearing which are provided in the jig device, a serration tool which is provided at one end of the jig device is stably rotated to perform the processing. In addition, the jig device includes a jig leg which simultaneously performs the centering operation. Through configuration in which the centering and jigging operations can be performed simultaneously with the serration processing, the speed and accuracy of the centering operation can be secured when the serration processing is operated.
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