Error factor identification device

An error factor identification device comprising:

• a storage section configured to store operation acceptability information indicating acceptability of an operation result of each of mounting operations executed multiple times in a component mounter and operation condition information indicating two or more of multiple constituent members of the component mounter and mounting job data, which are involved in each of the multiple mounting operations;
• a specification section configured to, when an occurrence rate or an occurrence count of an error in the mounting operation exceeds a predetermined value in at least one of the component mounter, the constituent member, and the mounting job data, specify the constituent member or the mounting job data that is a factor of the error by comparing two or more of an error involvement rate of each constituent member and an error involvement rate of the mounting job data calculated based on the operation acceptability information and the operation condition information, and
• an estimation section configured to estimate the constituent member or the mounting job data that is the factor of the error by using a predetermined estimation logic different from the comparison of the error involvement rates.