Cognitive behavioural model for OCD suggested a theory of compulsive checking, and demonstrated that symptoms of compulsive checking in OCD are exacerbated by three cognitive appraisals (perceived probability of harm, perceived seriousness of harm, perceived responsibility) that ultimately lead to an intrusive thought. In addition, safety behaviors, such as repeated checking, enhance or maintain the cognitive appraisals and OCD symptoms. According to the cognitive behavioural theory of OCD, this case report delineates the effectiveness of cognitive behavioural therapy (CBT) for an OCD patient who exhibited compulsive checking. As a result of CBT, OCD as measured by the Japanese version of the Obsessive Compulsive Inventory were alleviated. In conclusion, CBT was effective for this case. Cognitive intervention for the three cognitive appraisals might have been effective for the symptoms of compulsive checking in this case. In addition, the cognitive intervention may have enhanced exposure and responsive prevention therapy acceptability. In addition, psycho-education using metaphor might facilitate patients’ understanding of CBT concepts.