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This paper reexamined the theory (Kikuchi 1997, Kabaya 1999) that related the extension of “Saseteitadaku” to the use of “Itasu”. I surveyed the “Budget Committee” of “Diet Conference Proceedings” and investigated sample changes in the number of uses of “Itasu” and “Saseteitadaku”. I found out that As a result, until the Showa 50’s, the usage rate of “Itasu” was over 90% for “Saseteitadaku”, whereas in the 1980s the usage rate of “Saseteitadaku” exceeded “Itasu”. In order to investigated the cause of the transition from “Itasu” to “Saseteitadaku”, It investigated frequently used words in both expressions. Also examined the nature of the words that can be connected to each expression. I tried to clarify the relevance of the change of use of “Itasu” and “Saseteitadaku” from such investigation. As a result, it became clear that there is a relationship with the process of expanding use of “Saseteitadaku” approaching polite language on usage.