The purposes of the present article are to explain an outline about cognitive behavior therapy (CBT) and "total conviction". The effectiveness of CBT has been demonstrated by studies conducted in a number of countries. As a predecessor of CBT, cognitive therapy proposed the importance of examining cognitive factors such as "automatic thought" and "schemas". CBT supposes that efficient treatment is accomplished by restructuring these constructs. However, there is confusion regarding the understanding of cognitive modification and the difficulty of accurately capturing cognitive modification in a clinical situation. Negative effects, such as worsening of the therapeutic relationship and the occurrence of anxiety and depression, have been reported in some cases where a cognitive approach was used with a patient. The current study suggests that some therapists use a perspective of "total conviction" to solve these problems. A previous study revealed that "total conviction" is a cognitive factor that can enable this behavior. However, previous studies of "total conviction" involve several limitations. Finally, we discuss the potential future directions of research on "total conviction". We suggest that further study of "total conviction" may enable replication of the treatment process of CBT.