It is needed to establish a concrete theory of workers' process of behavior change for health. The interview of middle aged male workers in a large-scale company was held. A qualitative analysis with " Grounded theory approach" showed 3 steps and the following characteristics of behavior change among workers: Step 1 is "Introduction" which explains the process until behavior start to change. Step 2 is "Approach to take hold" which explains the process from the start of behavior change to the continuing or discontinuing of it. Step 3 is "Decision of advance or retreat" which is the process to make a directional behavior change. It was shown that independence of behavior change can be guessed from "Desire for behavior change" and "Cognition for probability of behavior change realization". When independence is not enough, "Support" by workers' superiors and colleagues back up workers' behavior change. To continue behavior change, it is necessary to enhance the understanding of the advantages of behavior change and to overcome the obstacles that may be encountered. Those who have positive cognition about behavior change can advance behavior change because they have obtained the power to tackle it. The support and approval from workers' superiors and colleagues increase workers' power to tackle it. From the above, public health nurses should focus on workers' cognition about health and behavior change and they should support to build a worksite culture which supports health.

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